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Expired European patentEurope

Selective etching method for a semiconductor multilayer structure

EP 0176166 B1 · Applicant: STC PLC

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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 April 29, 1985 and granted November 17, 1988. A European patent lasts at most 20 years from filing, so its term ended April 29, 2005.
  • 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 October 29, 2010.
  • 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.
FiledApril 29, 1985
PublishedApril 2, 1986
GrantedNovember 17, 1988
Term endedApril 29, 2005
Application numberEP 85303005
Classification (CPC)H10P50/692 +2 more

Timeline

Timeline From EPO dates

1986198819901992199419961998200020022004Application filedApril 29, 1985PublishedApril 2, 1986Patent grantedNov 17, 1988Term endedApril 29, 2005

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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