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Expired European patentEurope

Use of non-cyclic acetals or ketals as non-discolouring antiozonants

EP 0062809 B1 · Applicant: BAYER AG

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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 26, 1982 and granted May 23, 1984. A European patent lasts at most 20 years from filing, so its term ended March 26, 2002.
  • 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 26, 2007.
  • 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 26, 1982
PublishedOctober 20, 1982
GrantedMay 23, 1984
Term endedMarch 26, 2002
Application numberEP 82102542
Classification (CPC)C08K5/06

Timeline

Timeline From EPO dates

1983198519871989199119931995199719992001Application filedMarch 26, 1982PublishedOct 20, 1982Patent grantedMay 23, 1984Term endedMarch 26, 2002

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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