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Expired European patentEurope

Method of forming a semiconductor thin film and apparatus therefor

EP 0394462 B1 · Applicant: Nippon Telegraph and Telephone 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 August 15, 1989 and granted May 24, 1995. A European patent lasts at most 20 years from filing, so its term ended August 15, 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 February 15, 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.
FiledAugust 15, 1989
PublishedOctober 31, 1990
GrantedMay 24, 1995
Term endedAugust 15, 2009
Application numberEP 89909240
Classification (CPC)H10P14/2911 +2 more

Timeline

Timeline From EPO dates

1990199219941996199820002002200420062008Application filedAug 15, 1989PublishedOct 31, 1990Patent grantedMay 24, 1995Term endedAug 15, 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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