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European application, no grantEurope

Energizing circuit for discharge-type fire alarm sensor unit

EP 0037237 A2 · Applicant: DENTAN KABUSHIKI KAISHA

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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 24, 1981 and never granted as a European patent. Had it been granted, its 20-year term would have ended March 24, 2001.
  • 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 24, 2006.
  • 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 24, 1981
PublishedOctober 7, 1981
GrantedNever granted
Term endedMarch 24, 2001
Application numberEP 81301266
Classification (CPC)G08B17/12

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

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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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