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Expired European patentEurope

Racemizing of optically active alpha-substituted-alpha-phenylacetic acids

EP 0006284 B1 · Applicant: SUMITOMO CHEMICAL COMPANY, LIMITED

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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 April 27, 1979 and granted April 8, 1981. A European patent lasts at most 20 years from filing, so its term ended April 27, 1999.
  • 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 27, 2004.
  • 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 27, 1979
PublishedJanuary 9, 1980
GrantedApril 8, 1981
Term endedApril 27, 1999
Application numberEP 79300717
Classification (CPC)C07C51/487 +1 more

Timeline

Timeline From EPO dates

1980198219841986198819901992199419961998Application filedApril 27, 1979PublishedJan 9, 1980Patent grantedApril 8, 1981Term endedApril 27, 1999

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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