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Expired European patentEurope

A process for forming microcircuits

EP 0042894 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 June 30, 1980 and granted May 2, 1984. A European patent lasts at most 20 years from filing, so its term ended June 30, 2000.
  • 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 December 30, 2005.
  • 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.
FiledJune 30, 1980
PublishedJanuary 6, 1982
GrantedMay 2, 1984
Term endedJune 30, 2000
Application numberEP 80302194
Classification (CPC)G03F7/405

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedJune 30, 1980PublishedJan 6, 1982Patent grantedMay 2, 1984Term endedJune 30, 2000

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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.