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Expired European patentEurope

Estimating road friction coefficient

EP 0442500 B1 · Applicant: AKEBONO RESEARCH AND DEVELOPMENT CENTRE 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 February 14, 1991 and granted October 18, 1995. A European patent lasts at most 20 years from filing, so its term ended February 14, 2011.
  • 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 August 14, 2016.
  • 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.
FiledFebruary 14, 1991
PublishedAugust 21, 1991
GrantedOctober 18, 1995
Term endedFebruary 14, 2011
Application numberEP 91102108
Classification (CPC)B60T8/172 +1 more

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedFeb 14, 1991PublishedAug 21, 1991Patent grantedOct 18, 1995Term endedFeb 14, 2011

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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