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Expired European patentEurope

Method of preparing tetrahydrofuran polymers having ester end groups

EP 0090301 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 March 21, 1983 and granted August 6, 1986. A European patent lasts at most 20 years from filing, so its term ended March 21, 2003.
  • 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 September 21, 2008.
  • 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.
FiledMarch 21, 1983
PublishedOctober 5, 1983
GrantedAugust 6, 1986
Term endedMarch 21, 2003
Application numberEP 83102753
Classification (CPC)C08G65/20

Timeline

Timeline From EPO dates

1984198619881990199219941996199820002002Application filedMarch 21, 1983PublishedOct 5, 1983Patent grantedAug 6, 1986Term endedMarch 21, 2003

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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