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Expired European patentEurope

Particular dihydroxydiphenylbicycloalkanes, their preparation and their use for the preparation of high molecular polycarbonates

EP 0480237 B1 · Applicant: BAYER AG

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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 24, 1991 and granted November 30, 1994. A European patent lasts at most 20 years from filing, so its term ended September 24, 2011.
  • 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 24, 2017.
  • 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 24, 1991
PublishedApril 15, 1992
GrantedNovember 30, 1994
Term endedSeptember 24, 2011
Application numberEP 91116250
Classification (CPC)C07C37/20 +2 more

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedSep 24, 1991PublishedApril 15, 1992Patent grantedNov 30, 1994Term endedSep 24, 2011

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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