GA C II 11 Amendments under Article 19 PCT

Amendments under Article 19 PCT are published by the IB. They are particularly useful if there is a reason to better define the scope of the claims for the purpose of securing provisional protection in the PCT contracting states offering it (see point 671).
WIPO PCT Guide 9.004-9.011 
If the applicant wishes to file amendments to the claims, he must submit a complete set of the claims in replacement of all claims originally filed. Further, the basis for the amendments in the application as filed must be indicated in an accompanying letter. 
Section 205 AI 
WIPO PCT Guide  
PCT Newsletter  
9/2010, 12 
Amendments under Article 19 PCT are to be filed exclusively with the IB in the language of the international publication.
PCT Newsletter 6/2010, 8 
Any amendment to the claims under Article 19 PCT is to be made:
within two months from the date of transmittal of the search report, or 
within 16 months from the (earliest) priority date, 
whichever time limit expires later. 
Later filed amendments are accepted if they are received before the technical preparations for international publication have been completed. 

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EPO Guide for Applicants, part II Int.

EPO Guide for Applicants, part II Int. - C The EPO as ISA and SISA

EPO Guide for Applicants, part II Int. - E Euro-PCT procedure before the EPO as designated or elected Office

PCT Articles

PCT Implementing Rules