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Expired European patentEurope

Process for producing an optical waveguide and the product therefrom

EP 0341267 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 December 15, 1987 and granted February 16, 1994. A European patent lasts at most 20 years from filing, so its term ended December 15, 2007.
  • 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 15, 2013.
  • 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 15, 1987
PublishedNovember 15, 1989
GrantedFebruary 16, 1994
Term endedDecember 15, 2007
Application numberEP 88902758
Classification (CPC)C30B33/00 +2 more

Timeline

Timeline From EPO dates

1988199019921994199619982000200220042006Application filedDec 15, 1987PublishedNov 15, 1989Patent grantedFeb 16, 1994Term endedDec 15, 2007

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.