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Expired European patentEurope

Purine and pyrimidine compounds and their use as anti-viral agents

EP 0243670 B1 · Applicant: SYNTEX (U.S.A.) INC.

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Overview

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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 September 15, 1981 and granted July 22, 1992. A European patent lasts at most 20 years from filing, so its term ended September 15, 2001.
  • 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 March 15, 2007.
  • 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.
FiledSeptember 15, 1981
PublishedNovember 4, 1987
GrantedJuly 22, 1992
Term endedSeptember 15, 2001
Application numberEP 87104286
Classification (CPC)C07D473/00 +2 more

Timeline

Timeline From EPO dates

1982198419861988199019921994199619982000Application filedSep 15, 1981PublishedNov 4, 1987Patent grantedJuly 22, 1992Term endedSep 15, 2001

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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