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Expired European patentEurope

Fire retardant polycarbonates with improved critical thickness and process for their preparation

EP 0031958 B1 · Applicant: Mobay Chemical Corporation

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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 December 27, 1980 and granted August 28, 1985. A European patent lasts at most 20 years from filing, so its term ended December 27, 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 June 27, 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.
FiledDecember 27, 1980
PublishedJuly 15, 1981
GrantedAugust 28, 1985
Term endedDecember 27, 2000
Application numberEP 80108217
Classification (CPC)C07C317/00 +2 more

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedDec 27, 1980PublishedJuly 15, 1981Patent grantedAug 28, 1985Term endedDec 27, 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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.