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Expired European patentEurope

Method of manufacturing a plastic graded-index optical transmission element

EP 0447548 B1 · Applicant: MITSUBISHI RAYON CO., LTD.

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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 September 29, 1989 and granted January 17, 1996. A European patent lasts at most 20 years from filing, so its term ended September 29, 2009.
  • 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 March 29, 2015.
  • 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.
FiledSeptember 29, 1989
PublishedSeptember 25, 1991
GrantedJanuary 17, 1996
Term endedSeptember 29, 2009
Application numberEP 89910942
Classification (CPC)G02B3/00 +1 more

Timeline

Timeline From EPO dates

1990199219941996199820002002200420062008Application filedSep 29, 1989PublishedSep 25, 1991Patent grantedJan 17, 1996Term endedSep 29, 2009

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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