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Expired European patentEurope

Blends of polyethylene and polybutenes

EP 0163783 B1 · Applicant: Du Pont Canada Inc.

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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 May 22, 1984 and granted November 30, 1988. A European patent lasts at most 20 years from filing, so its term ended May 22, 2004.
  • 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 November 22, 2009.
  • 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.
FiledMay 22, 1984
PublishedDecember 11, 1985
GrantedNovember 30, 1988
Term endedMay 22, 2004
Application numberEP 84303478
Classification (CPC)C08L23/0815

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedMay 22, 1984PublishedDec 11, 1985Patent grantedNov 30, 1988Term endedMay 22, 2004

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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