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Expired European patentEurope

Driving circuit for stepping motor

EP 0394902 B1 · Applicant: Citizen Watch Co., 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 23, 1990 and granted October 20, 1993. A European patent lasts at most 20 years from filing, so its term ended April 23, 2010.
  • 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 23, 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.
FiledApril 23, 1990
PublishedOctober 31, 1990
GrantedOctober 20, 1993
Term endedApril 23, 2010
Application numberEP 90107630
Classification (CPC)H02P8/22

Timeline

Timeline From EPO dates

1991199319951997199920012003200520072009Application filedApril 23, 1990PublishedOct 31, 1990Patent grantedOct 20, 1993Term endedApril 23, 2010

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.