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Expired European patentEurope

Preparation of purines

EP 0756597 B1 · Applicant: SMITHKLINE BEECHAM PLC

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Listed from its EPO record in Patent Yard's archive of European patents past their term. Its claims, description and drawings are in the EPO PDF and on Google Patents, and the Claude kit works from them.

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Why it's free to use

  • Filed April 19, 1995 and granted May 16, 2001. A European patent lasts at most 20 years from filing, so its term ended April 19, 2015.
  • A supplementary protection certificate, which can extend a medicine or crop-protection patent, adds at most five and a half years, so even that would have ended by October 19, 2020.
  • We check European rights only. A US or other national patent in its family could still be in force: check its family on Espacenet or Google Patents.
FiledApril 19, 1995
PublishedFebruary 5, 1997
GrantedMay 16, 2001
Term endedApril 19, 2015
Application numberEP 95921751
Classification (CPC)C07D473/00

Timeline

Timeline From EPO dates

1996199820002002200420062008201020122014Application filedApril 19, 1995PublishedFeb 5, 1997Patent grantedMay 16, 2001Term endedApril 19, 2015

Sources & verification

Official EPO records

Full published documentClaims, description and drawings as a PDF.EPOEuropean Patent RegisterProcedure, status, file inspection and legal events.EPOLinked open EP data recordThe bibliographic record this page is built from.EPO

Cross-check elsewhere

Google PatentsFull text, worldwide family, citing patents and legal events.patents.google.comEspacenetNational family members and their legal status.European Patent Office

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