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Expired European patentEurope

Method for partially hydrogenating a monocyclic aromatic hydrocarbon

EP 0552809 B1 · Applicant: Asahi Kasei Kogyo Kabushiki Kaisha

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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 January 22, 1993 and granted July 10, 1996. A European patent lasts at most 20 years from filing, so its term ended January 22, 2013.
  • 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 July 22, 2018.
  • 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.
FiledJanuary 22, 1993
PublishedJuly 28, 1993
GrantedJuly 10, 1996
Term endedJanuary 22, 2013
Application numberEP 93101010
Classification (CPC)B01J8/222 +2 more

Timeline

Timeline From EPO dates

1994199619982000200220042006200820102012Application filedJan 22, 1993PublishedJuly 28, 1993Patent grantedJuly 10, 1996Term endedJan 22, 2013

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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