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Expired European patentEurope

An automatic servo gain calibration system for a disk drive

EP 0361222 B1 · Applicant: QUANTUM 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 September 14, 1989 and granted May 24, 1995. A European patent lasts at most 20 years from filing, so its term ended September 14, 2009.
  • 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 14, 2015.
  • 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 14, 1989
PublishedApril 4, 1990
GrantedMay 24, 1995
Term endedSeptember 14, 2009
Application numberEP 89117036
Classification (CPC)G11B5/5534

Timeline

Timeline From EPO dates

1990199219941996199820002002200420062008Application filedSep 14, 1989PublishedApril 4, 1990Patent grantedMay 24, 1995Term endedSep 14, 2009

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.