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Expired European patentEurope

Method for forming fresnel-type prism lens

EP 0320887 B1 · Applicant: ICHIKOH INDUSTRIES LIMITED

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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 13, 1988 and granted August 11, 1993. A European patent lasts at most 20 years from filing, so its term ended December 13, 2008.
  • 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 13, 2014.
  • 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 13, 1988
PublishedJune 21, 1989
GrantedAugust 11, 1993
Term endedDecember 13, 2008
Application numberEP 88120831
Classification (CPC)C03B11/082

Timeline

Timeline From EPO dates

1989199119931995199719992001200320052007Application filedDec 13, 1988PublishedJune 21, 1989Patent grantedAug 11, 1993Term endedDec 13, 2008

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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