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Expired European patentEurope

Servo-system for positioning an optical beam

EP 0274567 B1 · Applicant: SHARP KABUSHIKI KAISHA

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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 September 19, 1984 and granted April 22, 1992. A European patent lasts at most 20 years from filing, so its term ended September 19, 2004.
  • 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 March 19, 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.
FiledSeptember 19, 1984
PublishedJuly 20, 1988
GrantedApril 22, 1992
Term endedSeptember 19, 2004
Application numberEP 87112122
Classification (CPC)G11B7/0941 +2 more

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedSep 19, 1984PublishedJuly 20, 1988Patent grantedApril 22, 1992Term endedSep 19, 2004

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.