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Expired European patentEurope

Bandgap control in amorphous semiconductors

EP 0094426 B1 · Applicant: CHRONAR CORPORATION

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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 November 19, 1982 and granted August 5, 1987. A European patent lasts at most 20 years from filing, so its term ended November 19, 2002.
  • 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 May 19, 2008.
  • 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.
FiledNovember 19, 1982
PublishedNovember 23, 1983
GrantedAugust 5, 1987
Term endedNovember 19, 2002
Application numberEP 83900227
Classification (CPC)H10P14/3442 +2 more

Timeline

Timeline From EPO dates

1983198519871989199119931995199719992001Application filedNov 19, 1982PublishedNov 23, 1983Patent grantedAug 5, 1987Term endedNov 19, 2002

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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