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Patent Cooperation Treaty

Done at Washington on June 19, 1970,
amended on September 28, 1979,
modified on February 3, 1984, and on October 3, 2001

(as in force from April 1, 2002)

Table of Contents*


Introductory Provisions 

Chapter I: International Application and International Search 

  • Article 3 The International Application 
  • Article 4 The Request 
  • Article 5 The Description 
  • Article 6 The Claims 
  • Article 7 The Drawings 
  • Article 8 Claiming Priority 
  • Article 9 The Applicant 
  • Article 10 The Receiving Office 
  • Article 11 Filing Date and Effects of the International Application 
  • Article 12 Transmittal of the International Application to the International Bureau and the International Searching Authority 
  • Article 13 Availability of Copy of the International Application to Designated Offices 
  • Article 14 Certain Defects in the International Application 
  • Article 15 The International Search 
  • Article 16 The International Searching Authority 
  • Article 17 Procedure Before the International Searching Authority 
  • Article 18 The International Search Report 
  • Article 19 Amendment of the Claims Before the International Bureau 
  • Article 20 Communication to Designated Offices 
  • Article 21 International Publication 
  • Article 22 Copy, Translation, and Fee, to Designated Offices 
  • Article 23 Delaying of National Procedure 
  • Article 24 Possible Loss of Effect in Designated States 
  • Article 25 Review by Designated Offices 
  • Article 26 Opportunity to Correct Before Designated Offices 
  • Article 27 National Requirements 
  • Article 28 Amendment of the Claims, the Description, and the Drawings, Before Designated Offices 
  • Article 29 Effects of the International Publication 
  • Article 30 Confidential Nature of the International Application 

Chapter II: International Preliminary Examination 

  • Article 31 Demand for International Preliminary Examination 
  • Article 32 The International Preliminary Examining Authority 
  • Article 33 The International Preliminary Examination 
  • Article 34 Procedure Before the International Preliminary Examining Authority 
  • Article 35 The International Preliminary Examination Report 
  • Article 36 Transmittal, Translation, and Communication, of the International Preliminary Examination Report 
  • Article 37 Withdrawal of Demand or Election 
  • Article 38 Confidential Nature of the International Preliminary Examination 
  • Article 39 Copy, Translation, and Fee, to Elected Offices 
  • Article 40 Delaying of National Examination and Other Processing 
  • Article 41 Amendment of the Claims, the Description, and the Drawings, Before Elected Offices 
  • Article 42 Results of National Examination in Elected Offices 

Chapter III: Common Provisions 

Chapter IV: Technical Services 

Chapter V: Administrative Provisions 

Chapter VI: Disputes 

Chapter VII: Revision and Amendment 

Chapter VIII: Final Provisions

* Table of Contents added for the convenience of the reader; it does not appear in the original.