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Expired European patentEurope

Method of forming a lift-off mask with improved oxygen barrier layer

EP 0114229 B1 · Applicant: International Business Machines 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 15, 1983 and granted June 16, 1993. A European patent lasts at most 20 years from filing, so its term ended November 15, 2003.
  • 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 15, 2009.
  • 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 15, 1983
PublishedAugust 1, 1984
GrantedJune 16, 1993
Term endedNovember 15, 2003
Application numberEP 83111411
Classification (CPC)G03F7/094

Timeline

Timeline From EPO dates

1984198619881990199219941996199820002002Application filedNov 15, 1983PublishedAug 1, 1984Patent grantedJune 16, 1993Term endedNov 15, 2003

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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