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Expired European patentEurope

Synthetic lubricant for lubricating thin film and magnetic recording medium

EP 0287974 B1 · Applicant: HITACHI METALS, 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 April 15, 1988 and granted August 7, 1991. A European patent lasts at most 20 years from filing, so its term ended April 15, 2008.
  • 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 15, 2013.
  • 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 15, 1988
PublishedOctober 26, 1988
GrantedAugust 7, 1991
Term endedApril 15, 2008
Application numberEP 88106071
Classification (CPC)G11B5/71 +1 more

Timeline

Timeline From EPO dates

1989199119931995199719992001200320052007Application filedApril 15, 1988PublishedOct 26, 1988Patent grantedAug 7, 1991Term endedApril 15, 2008

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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