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Expired European patentEurope

Method and apparatus for grinding the surface of a semiconductor wafer

EP 0150074 B1 · Applicant: DISCO ABRASIVE SYSTEMS, LTD.

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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 January 23, 1985 and granted January 24, 1990. A European patent lasts at most 20 years from filing, so its term ended January 23, 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 July 23, 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.
FiledJanuary 23, 1985
PublishedJuly 31, 1985
GrantedJanuary 24, 1990
Term endedJanuary 23, 2005
Application numberEP 85100672
Classification (CPC)B24B7/16 +1 more

Timeline

Timeline From EPO dates

1986198819901992199419961998200020022004Application filedJan 23, 1985PublishedJuly 31, 1985Patent grantedJan 24, 1990Term endedJan 23, 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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