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Expired European patentEurope

Process for the preparation of cyclic sulfates

EP 0343053 B1 · Applicant: RHONE-POULENC SANTE

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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 May 12, 1989 and granted January 22, 1992. A European patent lasts at most 20 years from filing, so its term ended May 12, 2009.
  • 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 November 12, 2014.
  • 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.
FiledMay 12, 1989
PublishedNovember 23, 1989
GrantedJanuary 22, 1992
Term endedMay 12, 2009
Application numberEP 89401335
Classification (CPC)C07D327/10

Timeline

Timeline From EPO dates

1990199219941996199820002002200420062008Application filedMay 12, 1989PublishedNov 23, 1989Patent grantedJan 22, 1992Term endedMay 12, 2009

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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