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Expired European patentEurope

Polyimides and optical parts obtained by using the same

EP 0758665 B1 · Applicant: HITACHI CHEMICAL COMPANY, 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 July 26, 1996 and granted June 20, 2001. A European patent lasts at most 20 years from filing, so its term ended July 26, 2016.
  • 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 January 26, 2022.
  • 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.
FiledJuly 26, 1996
PublishedFebruary 19, 1997
GrantedJune 20, 2001
Term endedJuly 26, 2016
Application numberEP 96305494
Classification (CPC)C08G73/10 +2 more

Timeline

Timeline From EPO dates

1997199920012003200520072009201120132015Application filedJuly 26, 1996PublishedFeb 19, 1997Patent grantedJune 20, 2001Term endedJuly 26, 2016

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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