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Expired European patentEurope

Method and apparatus for determining elementary circuits and initial values of flows in a pipe network

EP 0626652 B1 · Applicant: TOKYO GAS COMPANY LIMITED

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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 14, 1993 and granted September 16, 1998. A European patent lasts at most 20 years from filing, so its term ended May 14, 2013.
  • 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 14, 2018.
  • 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 14, 1993
PublishedNovember 30, 1994
GrantedSeptember 16, 1998
Term endedMay 14, 2013
Application numberEP 93107883
Classification (CPC)F17D1/04 +1 more

Timeline

Timeline From EPO dates

1994199619982000200220042006200820102012Application filedMay 14, 1993PublishedNov 30, 1994Patent grantedSep 16, 1998Term endedMay 14, 2013

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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