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Expired European patentEurope

Reversal process for the production of chromium masks

EP 0101752 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 August 25, 1982 and granted August 27, 1986. A European patent lasts at most 20 years from filing, so its term ended August 25, 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 February 25, 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.
FiledAugust 25, 1982
PublishedMarch 7, 1984
GrantedAugust 27, 1986
Term endedAugust 25, 2002
Application numberEP 82107797
Classification (CPC)G03F1/68 +1 more

Timeline

Timeline From EPO dates

1983198519871989199119931995199719992001Application filedAug 25, 1982PublishedMarch 7, 1984Patent grantedAug 27, 1986Term endedAug 25, 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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