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Expired European patentEurope

Cryogenic rectification system for enhanced argon production

EP 0528331 B1 · Applicant: PRAXAIR TECHNOLOGY, INC.

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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 August 11, 1992 and granted May 24, 1995. A European patent lasts at most 20 years from filing, so its term ended August 11, 2012.
  • 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 February 11, 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.
FiledAugust 11, 1992
PublishedFebruary 24, 1993
GrantedMay 24, 1995
Term endedAugust 11, 2012
Application numberEP 92113665
Classification (CPC)F25J3/04412 +2 more

Timeline

Timeline From EPO dates

1993199519971999200120032005200720092011Application filedAug 11, 1992PublishedFeb 24, 1993Patent grantedMay 24, 1995Term endedAug 11, 2012

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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