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Expired European patentEurope

Improved timing of multiple gear train differential

EP 0394231 B1 · Applicant: ZEXEL-GLEASON USA, INC.

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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 March 21, 1988 and granted May 4, 1994. A European patent lasts at most 20 years from filing, so its term ended March 21, 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 September 21, 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.
FiledMarch 21, 1988
PublishedOctober 31, 1990
GrantedMay 4, 1994
Term endedMarch 21, 2008
Application numberEP 88903569
Classification (CPC)F16H48/29

Timeline

Timeline From EPO dates

1989199119931995199719992001200320052007Application filedMarch 21, 1988PublishedOct 31, 1990Patent grantedMay 4, 1994Term endedMarch 21, 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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