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Expired European patentEurope

Gas heater for processing gases

EP 0666972 B1 · Applicant: WATKINS-JOHNSON COMPANY

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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 November 3, 1993 and granted January 7, 1999. A European patent lasts at most 20 years from filing, so its term ended November 3, 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 May 3, 2019.
  • 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.
FiledNovember 3, 1993
PublishedAugust 16, 1995
GrantedJanuary 7, 1999
Term endedNovember 3, 2013
Application numberEP 94900500
Classification (CPC)F24H3/0405

Timeline

Timeline From EPO dates

1994199619982000200220042006200820102012Application filedNov 3, 1993PublishedAug 16, 1995Patent grantedJan 7, 1999Term endedNov 3, 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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.