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Expired European patentEurope

A process for producing an alpha,beta-unsaturated carbonyl compound

EP 0404497 B1 · Applicant: NIPPON ZEON CO., LTD.

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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 June 19, 1990 and granted June 1, 1994. A European patent lasts at most 20 years from filing, so its term ended June 19, 2010.
  • 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 December 19, 2015.
  • 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.
FiledJune 19, 1990
PublishedDecember 27, 1990
GrantedJune 1, 1994
Term endedJune 19, 2010
Application numberEP 90306647
Classification (CPC)C07C45/54

Timeline

Timeline From EPO dates

1991199319951997199920012003200520072009Application filedJune 19, 1990PublishedDec 27, 1990Patent grantedJune 1, 1994Term endedJune 19, 2010

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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