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Expired European patentEurope

Improved heat-strengthening process

EP 0205346 B1 · Applicant: E.I. DU PONT DE NEMOURS AND COMPANY

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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 June 11, 1986 and granted September 12, 1990. A European patent lasts at most 20 years from filing, so its term ended June 11, 2006.
  • 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 December 11, 2011.
  • 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.
FiledJune 11, 1986
PublishedDecember 17, 1986
GrantedSeptember 12, 1990
Term endedJune 11, 2006
Application numberEP 86304467
Classification (CPC)D01D11/06 +2 more

Timeline

Timeline From EPO dates

1987198919911993199519971999200120032005Application filedJune 11, 1986PublishedDec 17, 1986Patent grantedSep 12, 1990Term endedJune 11, 2006

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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