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Expired European patentEurope

Separation of gas mixtures by partial condensation

EP 0091830 B1 · Applicant: British Gas Corporation

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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 13, 1983 and granted August 12, 1987. A European patent lasts at most 20 years from filing, so its term ended April 13, 2003.
  • 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 13, 2008.
  • 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 13, 1983
PublishedOctober 19, 1983
GrantedAugust 12, 1987
Term endedApril 13, 2003
Application numberEP 83302073
Classification (CPC)F25J3/0655 +2 more

Timeline

Timeline From EPO dates

1984198619881990199219941996199820002002Application filedApril 13, 1983PublishedOct 19, 1983Patent grantedAug 12, 1987Term endedApril 13, 2003

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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