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Expired European patentEurope

Use of styrene polymers for the preparation of optical system

EP 0025159 B1 · Applicant: BAYER AG

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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 August 25, 1980 and granted May 9, 1984. A European patent lasts at most 20 years from filing, so its term ended August 25, 2000.
  • 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 February 25, 2006.
  • 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.
FiledAugust 25, 1980
PublishedMarch 18, 1981
GrantedMay 9, 1984
Term endedAugust 25, 2000
Application numberEP 80105036
Classification (CPC)C08F12/20

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedAug 25, 1980PublishedMarch 18, 1981Patent grantedMay 9, 1984Term endedAug 25, 2000

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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