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Expired European patentEurope

Method of operating a bivalent heating system

EP 0128405 B1 · Applicant: SIEMENS AKTIENGESELLSCHAFT

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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 May 21, 1984 and granted October 1, 1986. A European patent lasts at most 20 years from filing, so its term ended May 21, 2004.
  • 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 November 21, 2009.
  • 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.
FiledMay 21, 1984
PublishedDecember 19, 1984
GrantedOctober 1, 1986
Term endedMay 21, 2004
Application numberEP 84105782
Classification (CPC)G05D23/1919 +1 more

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedMay 21, 1984PublishedDec 19, 1984Patent grantedOct 1, 1986Term endedMay 21, 2004

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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