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Expired European patentEurope

A catalyst for asymmetric induction

EP 0505089 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 March 12, 1992 and granted December 14, 1994. A European patent lasts at most 20 years from filing, so its term ended March 12, 2012.
  • 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 September 12, 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.
FiledMarch 12, 1992
PublishedSeptember 23, 1992
GrantedDecember 14, 1994
Term endedMarch 12, 2012
Application numberEP 92302120
Classification (CPC)B01J31/0241 +2 more

Timeline

Timeline From EPO dates

1993199519971999200120032005200720092011Application filedMarch 12, 1992PublishedSep 23, 1992Patent grantedDec 14, 1994Term endedMarch 12, 2012

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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