Patent Deadline Tracker (India) - Key Statutory Timelines

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v1.4 · Legal position as on 17 July 2026

Indian Patent Prosecution: Deadline Reference

Key statutory timelines for applicants, parties, and the Patent Office under the Patents Act 1970 and the Patents Rules 2003, as amended up to the Patents (Amendment) Rules 2024 (G.S.R. 211(E), in force 15 March 2024), verified against the gazette text and official IPO guidance, arranged in prosecution order. Scope: prosecution and post-grant timelines; compulsory licensing, penalty adjudication (Chapter XIV-A), and patent agent registration timelines are excluded.

How to use this reference

  1. Search by any word that appears in a row: an action ("renewal"), a form ("Form 27"), or a provision ("24B"). Filter by prosecution stage, or show hard-docket deadlines only.
  2. ACT HARD STOP marks a period prescribed by the Act itself with no identified extension route; Rule 138 does not operate on Act periods. Missing one causes abandonment or loss of the right.
  3. DOCKET HARD marks a Rules period with severe consequences where Rule 138 is facially open on the text but its availability is unsettled in practice; docket these as hard and do not rely on Rule 138 without current authority (Note 1).
  4. OFFICE marks a Patent Office service timeline (something the office must do, not you); the consequence of non-compliance is not specified in the Rules. These are included for completeness of prosecution tracking.
  5. NOTE marks a caution explained in the notes section; read the note before advising on that deadline.
  6. The Deadline column carries only the period or date expression; qualifications, conditions, and consequences sit in the Remarks column.
  7. The Extension column states the specific statutory route. "No specific extension in the governing rule" means exactly that: it does not by itself mean Rule 138 is unavailable; see the extension legend in the notes. Where Form 4 is named, the per-month fee depends on entity type; see the fee reference below.
  8. For PCT national phase matters: the statutory filing date is the international filing date (Section 7(1B)); several filing-stage periods expressly run from the actual Indian filing date where the rule says so (Rules 10, 12(1A), and the Explanation to Rule 13(6)).

A. Filing stage

A. Filing stage: Indian patent deadlines
#ActionTrigger dateDeadlineExtension / condonationRemarksProvision
1File complete specification after provisional ACT HARD STOPDate of filing of provisional12 monthsAct period; Rule 138 does not operate on periods prescribed by the Act. Application deemed abandoned if not filedSection 9(1)
2Convert complete to provisional (request) Date of filing12 monthsNot applicableSection 9(3)
3File convention application in India ACT HARD STOPDate of first application in convention country (earliest, if multiple)12 monthsAct period; Rule 138 does not operate on periods prescribed by the ActSections 135(1), 135(2)
4Complete specification claiming priority from earlier Indian application Date of previously filed Indian application12 monthsNot applicableFor the priority claim to holdSection 11(3A)
5PCT national phase entry in India DOCKET HARDNOTE 1Priority date (Article 2(xi))31 monthsDocket as hard; Rule 138 position unsettled (Note 1)Rule 20(4)(i)
6Post-dating of application Date application actually made6 months (maximum)Not applicableSection 17(1) proviso
7Limited grace period: display or use at a Central Government notified exhibition, or paper read before a learned society (Form 31) Opening of the notified exhibition, or reading/publication of the paper12 monthsNot applicableConditions: display, use or publication with the consent of the true and first inventor or a person deriving title (Section 31 clauses (a) to (d)); claim via Form 31 with evidenceSection 31; Rule 29A
8Prior public working for reasonable trial (anticipation exception) Priority date of the relevant claim1 year before priority dateNot applicableWorking by or with the consent of the applicant, for reasonable trial reasonably requiring public workingSection 32
9Proof of right (assignment cases) Date of filing in India (actual Indian filing date for national phase)6 monthsRule 138 (up to 6 months, Form 4)Rule 10
10Power of attorney (Form 26) NOTE 2Date of filing of application or document3 monthsNo specific extension in Rule 135(1); IPO portal practice directs the Rule 138 route for late filing; verify current practice (Note 2)No further processing until filedRule 135(1)
11First Form 3 statement and undertaking (Section 8) Date of filing in India (actual Indian filing date for national phase)6 monthsUp to 3 months, Form 4Rules 12(1A), 12(5)
12Declaration of inventorship (Form 5), where Rule 13(6) applies Date of filing of complete specification (for PCT national phase: the actual Indian filing date, per the Explanation to Rule 13(6))With the complete specification, or 1 monthAs stated (Form 4)One month with Controller permission (Form 4). Applies to complete-after-provisional, convention, and PCT national phase cases; not required for an ordinary application filed with a complete specification at the outsetRule 13(6)
13Reference to deposit of biological material in specification Date of filing of application3 monthsRule 138On or before the Form 9 request if early publication soughtRule 13(8)
14Priority document / verified English translation (PCT national phase) Date of Patent Office invitation3 monthsNo specific extension in Rule 21(3); Rule 21 is excluded from Rule 137; consider Rule 138 separately and cautiouslyFailing which the priority claim may be disregardedRule 21(3)
15Submission of original documents when demanded after electronic filing Date documents are asked to be submitted in original15 daysNo specific extension in Rule 6(1A)Failing which the documents are deemed not to have been filedRule 6(1A)

B. Secrecy directions and foreign filing permission

B. Secrecy directions and foreign filing permission: Indian patent deadlines
#ActionTrigger dateDeadlineExtension / condonationRemarksProvision
16Controller disposal of foreign filing permission request (Form 25) OFFICEDate of filing the request (defence/atomic energy: date of receipt of Central Government consent)21 daysPatent Office timeline; consequence of non-compliance not specifiedDefence/atomic energy: counted from receipt of Central Government consentRule 71(2)
17Communication of result of reconsideration of secrecy directions OFFICEReceipt of the notice by the Controller15 daysPatent Office timeline; consequence of non-compliance not specifiedSection 36(2); Rule 72(1)
18Extension of time on revocation of secrecy directions Revocation of directions under Section 38Up to the period the Section 35(1) directions were in forceAs statedSection 38; Rule 72(2)

C. Publication and examination

C. Publication and examination: Indian patent deadlines
#ActionTrigger dateDeadlineExtension / condonationRemarksProvision
19Publication of application (automatic) Date of filing or priority, whichever earlier18 monthsNot applicablePublication ordinarily within 1 month thereafterSection 11A; Rule 24
20Early publication request (Form 9) Any time before 18-month publicationAny time before 18-month publicationNot applicablePublication ordinarily within 1 month of requestSection 11A(2); Rules 24A, 24
21Request for examination (Form 18) DOCKET HARDNOTE 1Priority date or filing date, whichever earlier31 monthsDocket as hard; Rule 138 position unsettled (Note 1)31 months for applications filed on or after 15 March 2024 (Note 6)Rule 24B(1)(i), (vi)
22RFE where secrecy direction revoked NOTE 6As in the preceding row, or revocation of secrecy direction31 months, or 6 months from revocation, whichever laterAs statedTransitional preservation applies to pre-15 March 2024 filings (Note 6)Rule 24B(1)(iii)
23Divisional application (voluntary or to meet unity objection) Not date-triggeredAny time before grant of the parentNot applicableSection 16(1); Rule 13(2A)
24RFE for divisional NOTE 1Filing/priority of parent, or filing of divisional31 months, or 6 months from filing of the divisional, whichever laterSee Note 1Transitional preservation applies to pre-15 March 2024 filings (Note 6)Rule 24B(1)(iv)
25Reference of application to the examiner OFFICEFiling of RFE and publicationIn RFE filing orderPatent Office timeline; consequence of non-compliance not specifiedDivisional: published within 1 month and referred within 1 month of that publicationRule 24B(2)(i)
26Examiner report (ordinary examination) OFFICEDate of reference to the examinerOrdinarily 1 month, maximum 3 monthsPatent Office timeline; consequence of non-compliance not specifiedSection 12(2); Rule 24B(2)(ii)
27Controller disposal of examiner report (ordinary) OFFICEReceipt of the report by the ControllerOrdinarily 1 monthPatent Office timeline; consequence of non-compliance not specifiedRule 24B(2)(iii)
28Issuance of first statement of objections (ordinary) OFFICEDisposal of the examiner report1 monthPatent Office timeline; consequence of non-compliance not specifiedRule 24B(3)
29Response to FER / putting application in order (ordinary) NOTE 4Date of issuance of first statement of objections6 monthsFurther 3 months on Form 4; the amended wording supports filing the request within the extension window, including after the initial 6 months; verify current IPO practice before relying on a post-six-month filing (Note 4)Section 21(1); Rule 24B(5), (6)
30Updated Form 3 (corresponding foreign applications) Date of issuance of FER (ordinary or expedited)3 monthsUp to 3 months, Form 4Rules 12(2), 12(5)
31Fresh Form 3 on Controller direction under Section 8(2) Date of Controller communication2 monthsUp to 3 months, Form 4Rules 12(4), 12(5)
32Extension where High Court appeal is pending at expiry of the Section 21 period Expiry of the period for putting the application in orderUntil such date as the High Court determinesAs statedThe application for extension must be made before expiry of the prescribed periodSection 21(2)
33Further period where the appeal window has not expired Expiry of the Section 21 period while the time to appeal remains openSuch further period as the Controller determinesAs statedIf an appeal is then filed, compliance within the time the High Court grantsSection 21(3)
34Examiner report (expedited examination) OFFICEDate of reference to the examinerOrdinarily 1 month, maximum 2 monthsPatent Office timeline; consequence of non-compliance not specifiedRule 24C(6)
35Controller disposal of examiner report (expedited) OFFICEReceipt of the report1 monthPatent Office timeline; consequence of non-compliance not specifiedRule 24C(7)
36Issuance of first statement of objections (expedited) OFFICEDisposal of the examiner report15 daysPatent Office timeline; consequence of non-compliance not specifiedRule 24C(8)
37Response to FER (expedited examination) NOTE 4Date of issuance of first statement of objections6 monthsFurther 3 months on Form 4 (same structure as Note 4)Rule 24C(10), (11)
38Controller disposal of application (expedited) OFFICEReceipt of last reply, or last date to put in order, whichever earlier3 monthsPatent Office timeline; consequence of non-compliance not specifiedLimit does not apply where a pre-grant opposition has been filed (proviso)Rule 24C(12)
39Request for hearing on gist of objections Communication of the gist of objections1 monthThe Controller may allow a shorter interval under the second proviso to Rule 28(2); this is discretion on the ten-day cut-off, not an extension of the one monthSubject also to the Rule 28(2) proviso: the request must be made on a date earlier than 10 days before the final date for putting the application in order under Section 21(1)Rule 28(2), (3)
40Written submissions after hearing Date of hearing15 daysNo specific extension in Rule 28(7)Rule 28(7)
41Removing prior-claiming objection where otherwise in order Controller decision to postpone grant2 monthsAs the Controller may fix after hearingThereafter a hearing is fixed with at least 10 days notice; amendment within the period the Controller fixes after hearingRules 29(2), 30

D. Pre-grant opposition (Section 25(1))

D. Pre-grant opposition (Section 25(1)): Indian patent deadlines
#ActionTrigger dateDeadlineExtension / condonationRemarksProvision
42File representation (Form 7A) Publication under Section 11AAny time: after publication, before grantNot applicableConsidered only after RFE on recordSection 25(1); Rule 55(1), (2)
43Earliest possible grant Publication under Section 11ANot before 6 months from publicationNot applicableRule 55(1A)
44Controller orders on the representation (all three branches) OFFICEPer branch1 month (each branch)Patent Office timeline; consequence of non-compliance not specifiedBranches: no prima facie case, no hearing sought: from notification; no prima facie case, hearing sought: from the hearing; prima facie case made out: from receipt of the representation, with notice to the applicantRule 55(3)
45Applicant statement and evidence after prima facie notice Date of notice to applicant2 monthsNo specific extension in Rule 55(4); Rule 55(4) is excluded from Rule 137Reduced from 3 months by the 2024 amendmentRule 55(4)
46Speaking order deciding application and representation together OFFICECompletion of proceedingsOrdinarily 1 monthPatent Office timeline; consequence of non-compliance not specifiedThe Rule 62(2) to (4) hearing procedure applies via Rule 55(5A)Rule 55(5), (5A)
47Examination track for opposed applications Notice issued on the representationNot a deadlineConsequence provision, not a deadlineAn application in which a representation has been filed and notice issued is examined under the expedited route (Rule 24C)Rule 55(5B)

E. Grant

E. Grant: Indian patent deadlines
#ActionTrigger dateDeadlineExtension / condonationRemarksProvision
48Issue of patent certificate OFFICEDate of grantOrdinarily 7 daysPatent Office timeline; consequence of non-compliance not specifiedRule 74(1)

F. Post-grant opposition (Section 25(2)) and opposition hearings

F. Post-grant opposition (Section 25(2)) and opposition hearings: Indian patent deadlines
#ActionTrigger dateDeadlineExtension / condonationRemarksProvision
49Notice of opposition (Form 7) by person interested ACT HARD STOPDate of publication of grant in the journal12 monthsAct period; Rule 138 does not operate on periods prescribed by the ActSection 25(2)
50Patentee reply statement and evidence DOCKET HARDReceipt of opponent written statement and evidence2 monthsNo specific extension in Rule 58; the consequence is statutory; Rule 138 reliance unsettled, docket as hardFailure: patent deemed revokedRule 58(1), (2)
51Opponent reply evidence (confined to patentee evidence) Delivery of patentee reply statement and evidence1 monthFurther evidence only with leave (Rule 60)Confined to matters strictly in reply to the patentee evidence; further evidence only with leave (Rule 60)Rule 59
52Opposition Board recommendation OFFICEDate documents forwarded to the Board2 monthsPatent Office timeline; consequence of non-compliance not specifiedReduced from 3 months by the 2024 amendmentRule 56(4)
53Notice of opposition hearing OFFICECompletion of evidence and receipt of the Board recommendationNot less than 10 days noticePatent Office timeline; consequence of non-compliance not specifiedApplies to pre-grant hearings via Rule 55(5A)Rule 62(1)
54Notice of intention to attend the hearing Fixing of the hearingBefore the hearingAs statedNotice with the First Schedule fee; the Controller may refuse to hear a party who has not given noticeRule 62(2), (3)
55Reliance on a publication not already on record at the hearing Intention to rely at the hearingNot less than 5 days noticeNo specific extension in Rule 62(4)With details of the publication, to the other party and the ControllerRule 62(4)

G. Maintenance and compliance

G. Maintenance and compliance: Indian patent deadlines
#ActionTrigger dateDeadlineExtension / condonationRemarksProvision
56Renewal fee (each year, 3rd year onward) Expiration of the 2nd year from date of patent, and each succeeding yearBefore expiration of the relevant yearUp to 6 months on Form 4 with feePayable at expiration of the 2nd year and each succeeding yearSection 53(2); Rule 80(1), (1A)
57Accumulated renewal fees where grant later than 2 years from filing Date of recordal of patent in the register3 monthsExtendable to not later than 9 months from recordalSection 142(4)
58Statement of working (Form 27) NOTE 3Expiry of each 3-financial-year block (blocks run from the FY after the FY of grant)6 monthsUp to 3 months under the Rule 131(2) proviso, Form 4; further up to 6 months under Rule 138 per the CGPDTM Form 27 FAQ of 26 August 2024, subject to Rule 138 conditions and fee (Note 3)In practice by 30 September of the filing year (Note 3)Section 146(2); Rule 131(2)
59Information on working demanded by Controller notice Date of Controller notice2 monthsAs statedOr such further time as the Controller allowsSection 146(1)

H. Restoration of lapsed patent

H. Restoration of lapsed patent: Indian patent deadlines
#ActionTrigger dateDeadlineExtension / condonationRemarksProvision
60Application for restoration (Form 15) ACT HARD STOPDate patent ceased to have effect18 monthsAct period; Rule 138 does not operate on periods prescribed by the ActSection 60(1)
61Request to be heard where no prima facie case found Controller intimation1 monthNo specific extension in Rule 84(2)Rule 84(2), (3)
62Opposition to restoration (Form 14) Publication of the restoration application2 monthsNo specific extension in Rule 85(1)Rule 85(1)
63Payment of unpaid renewal and additional fee after restoration order Date of order allowing restoration1 monthNo specific extension in Rule 86(1)Rule 86(1)

I. Amendment, surrender and correction

I. Amendment, surrender and correction: Indian patent deadlines
#ActionTrigger dateDeadlineExtension / condonationRemarksProvision
64Opposition to post-grant amendment application (Form 14) Publication of the amendment application3 monthsNo specific extension in Rule 81(3)(b)Rule 81(3)(b)
65Opposition to surrender of patent (Form 14) Publication of the notice of offer to surrender3 monthsNo specific extension in Rule 87(2)Rule 87(2)
66Opposition to correction of clerical error (Form 14) Advertisement of the request3 monthsNo specific extension in Rule 124(1)Rule 124(1)

J. Review, appeal and consequential requests

J. Review, appeal and consequential requests: Indian patent deadlines
#ActionTrigger dateDeadlineExtension / condonationRemarksProvision
67Review of Controller decision (Form 24) Communication of the decision1 monthFurther period not exceeding 1 month, on Form 4Section 77(1)(f); Rule 130(1)
68Setting aside ex parte order (Form 24) Communication of the order1 monthFurther period not exceeding 1 month, on Form 4Section 77(1)(g); Rule 130(2)
69Appeal to High Court Date of decision, order or direction of the Controller3 monthsHigh Court discretionSection 117A(4)
70Request for grant following order under Section 26(1) or Section 52(2) (Form 12) Date of the Controller order (Rule 63A) or of the court/Appellate Board order (Rule 79)3 monthsNo specific extension in Rules 63A/79Rules 63A, 79
71Request or claim for mention of inventor (Form 8) Section 28 procedureBefore grant; certificate under Section 28(7): any timeNot applicableThe before-grant limit applies to requests and claims under Sections 28(2) and 28(3), per Section 28(4)Section 28; Rules 66 to 68

K. General extension and condonation powers

K. General extension and condonation powers: Indian patent deadlines
#ActionTrigger dateDeadlineExtension / condonationRemarksProvision
72General power to extend time or condone delay NOTE 1Any time specified for any act or proceeding under the RulesUp to 6 monthsFee: Rs 10,000 or Rs 50,000 per month by entity (Note 1). Rules periods only; does not alter periods prescribed by the ActOn Form 4; request within the 6-month extended window; multiple requests allowedRule 138 (substituted 2024)
73Condonation for delayed receipt of a Patent Office communication Receipt of the delayed document or communicationImmediately after receiptCondonation capped at the gap between ordinary-course receipt and actual receiptWith a statement of circumstances and evidenceRule 6(5)
74Condonation for force majeure (war, calamity, outage of e-services) Delay in transmitting/resubmitting a document or performing an act1 month from the situation ceasingCapped at the emergency period or 6 months from expiry of the prescribed period, whichever earlierRule 6(6)
75Power to obviate irregularity (excluded matters listed) NOTE 1Documents/irregularities with no specific provisionNot applicableUse the specific provision or Rule 138 where applicableExcluded matters: Rules 12(5); 20(4)(i), 20(6); 21; 24B(1),(5),(6); 24C(10),(11); 55(4); 80(1A); 130(1),(2); 131(2)Rule 137; Rule 137(2)
Related toolPCT National Phase CalculatorThis tracker explains the deadlines surrounding national phase entry. The calculator works out the 31-month date and the official India fees for a specific case.Open the PCT calculator

Notes and annexes

Extension legend: how to read the extension column

Three layers apply. First, a specific extension expressly provided in the governing rule (stated in the row). Second, the general Rule 138 power: for periods prescribed under the Rules, Rule 138 is facially available on its text (up to 6 months, Form 4, request within the extended window), subject to statutory interpretation and current Patent Office practice; it is not an entitlement. Third, Act periods: Rule 138 is a rule-making power under the Act and does not alter a period prescribed by the Act itself (for example Sections 9(1), 25(2), 60(1), 135).

Note 1: Rule 138 and the 31-month deadlines (national phase and RFE)

Verified against the gazette (G.S.R. 211(E)): the substituted Rule 138 opens with "Notwithstanding anything contained in these rules" and carries no exclusion list, while the new Rule 137(2) exclusion list expressly names Rule 20(4)(i) and 20(6) (national phase) and Rule 24B(1), (5) and (6) (RFE and FER). The drafting therefore closes the Rule 137 route for these items but leaves the Rule 138 text facially open to them. Fee: Rs 10,000 per month (natural person, startup, small entity or educational institution) or Rs 50,000 per month (others), e-filing, per First Schedule entry 4(v).

Position: whether the Controller will in fact grant Rule 138 extensions against the 31-month national phase and RFE deadlines remains unsettled; no judicial authority or dated IPO instruction squarely resolves it. Docket both as hard; verify live IPO practice before advising any client that a Rule 138 extension is available for either.

Note 2: Late power of attorney and Form 1 documents

Rule 135(1) prescribes 3 months for the Form 26 authorisation, with no further processing until it is filed; it contains no specific extension. Reports of current IPO e-filing portal behaviour indicate that late filing of the power of attorney and of Form 1 documents is routed through Rule 138 with its per-month fee rather than Rule 137 petitions. This is a description of portal practice, not a statutory rule; confirm current portal behaviour before quoting costs.

Note 3: Form 27 windows and the late-filing framework

Per the CGPDTM Form 27 FAQ dated 26 August 2024: for patents granted before FY 2022-23, the first 3-financial-year block is FY 2023-24 to FY 2025-26, with the normal filing window running 1 April 2026 to 30 September 2026. The FAQ further illustrates the late-filing framework: extension or condonation of up to 3 months under the Rule 131(2) proviso (Form 4), and thereafter a further period of up to 6 months under Rule 138, subject to its conditions and fee (in the FAQ's worked example, an outer date of 30 June 2027 for the current block). The FAQ is official guidance, not statute; the Rules text governs.

Note 4: FER extension mechanics after the 2024 amendment

The gazette substituted "specified under sub-rule (5)" in Rule 24B(6) with "specified herein". That amended wording supports filing the Form 4 request within the available three-month extension window, including after expiry of the initial six-month period; the same structure applies under Rule 24C(11). This reading is consistent with reported portal implementation, but no dated IPO instruction is cited here and Controller practice may be material. Check current IPO practice before relying on a post-six-month filing.

Note 5: Amendment chain and what is out of scope

(a) Patents (Amendment) Rules 2024, G.S.R. 211(E), in force 15 March 2024: all prosecution timeline changes reflected here. (b) Patents (Second Amendment) Rules 2024, G.S.R. 215(E), 16 March 2024: inserted the first version of Chapter XIV-A on adjudication of penalties under Sections 120, 122 and 123. (c) Patents (Amendment) Rules 2025, G.S.R. 865(E), 25 November 2025: substituted Chapter XIV-A with a detailed framework (complaint Form 32; appeal Form 33 within 60 days; adjudication order within 3 months of notice; appellate disposal ordinarily within 6 months), omitting the clashing forms. Items (b) and (c) create enforcement timelines only, not prosecution deadlines, and are excluded from the table.

Note 6: Transitional RFE regime and the PCT filing date

For applications filed before 15 March 2024, the pre-amendment RFE period (48 months) is preserved by Rule 24B(1)(vi). For determining whether the pre-amendment regime applies, use the statutory filing date: in a PCT national phase application, that is the international filing date under Section 7(1B), not the date on which national phase papers were submitted in India. Precision point: clause (vi) literally references the period "under sub-section (1) of section 11B"; for the secrecy and divisional branches of the sub-rule in pre-2024 filings, apply the pre-amendment text of those branches and verify the operative period for the specific case.

Extension fee quick reference (per month, e-filing, First Schedule entry 4)
Extension fees per month by provision and entity type
Provision coveredNatural person / startup / small entity / educational institutionOthers
Sections 53(2), 142(4); Rules 13(6), 80(1A), 130Rs 480Rs 2,400
Entry 4(ii), gazette text as printed: "under subrule (4) of rule 12 or sub rule (2) or rule 131". Editorial note: the wording contains an apparent drafting anomaly; it is generally read as covering Rule 12(4) and Rule 131(2)Rs 2,000Rs 10,000
Rule 24B(6) (FER response extension)Rs 1,000Rs 4,000
Rule 24C(11) (expedited FER response extension)Rs 2,000Rs 10,000
Rule 138 (general extension or condonation)Rs 10,000Rs 50,000

Also per the gazette: pre-grant opposition (Form 7A) carries a fee of Rs 4,000 or Rs 20,000 and post-grant opposition (Form 7) Rs 8,000 or Rs 40,000, e-filing only. Form 4 is the vehicle for all extensions above.

Sources and verification record

Statutory instruments relied on: the Patents Act 1970 (consolidated); the Patents Rules 2003 (consolidated, as amended); the Patents (Amendment) Rules 2024, G.S.R. 211(E), 15 March 2024 (verified against the gazette text clause by clause); the Patents (Second Amendment) Rules 2024, G.S.R. 215(E), 16 March 2024; the Patents (Amendment) Rules 2025, G.S.R. 865(E), 25 November 2025. Primary access points: indiacode.nic.in and ipindia.gov.in.

Official guidance (practice material, not statute): the CGPDTM FAQs on Form 27 dated 26 August 2024 (ipindia.gov.in), relied on for the Form 27 windows and late-filing framework in Note 3; reported IPO e-filing portal behaviour, relied on only in Notes 2 and 4 and expressly flagged as practice.

Review status: full row-by-row citation review completed 17 July 2026, including a correction pass following an independent external audit. Where a proposition rests on practice material or an unsettled interpretation, the row carries a NOTE mark. Draft instruments are excluded. Report corrections to Intepat IP.