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Expired European patentEurope

Process and device for affecting measurement and shape changes in the hardening of workpieces

EP 0553154 B1 · Applicant: ZAHNRADFABRIK FRIEDRICHSHAFEN AG

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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 October 12, 1991 and granted July 27, 1994. A European patent lasts at most 20 years from filing, so its term ended October 12, 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 April 12, 2017.
  • 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.
FiledOctober 12, 1991
PublishedAugust 4, 1993
GrantedJuly 27, 1994
Term endedOctober 12, 2011
Application numberEP 91917790
Classification (CPC)C21D9/32 +1 more

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedOct 12, 1991PublishedAug 4, 1993Patent grantedJuly 27, 1994Term endedOct 12, 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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