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Expired European patentEurope

Polyetherketones and polyethersulphones based on phenylindane and their use for optical systems

EP 0557950 B1 · Applicant: HOECHST AKTIENGESELLSCHAFT

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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 February 24, 1993 and granted October 30, 1996. A European patent lasts at most 20 years from filing, so its term ended February 24, 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 August 24, 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.
FiledFebruary 24, 1993
PublishedSeptember 1, 1993
GrantedOctober 30, 1996
Term endedFebruary 24, 2013
Application numberEP 93102846
Classification (CPC)C07C317/14 +2 more

Timeline

Timeline From EPO dates

1994199619982000200220042006200820102012Application filedFeb 24, 1993PublishedSep 1, 1993Patent grantedOct 30, 1996Term endedFeb 24, 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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