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Expired European patentEurope

Process for recovering oxygen enriched gas

EP 0334495 B1 · Applicant: SUMITOMO SEIKA CHEMICALS CO., LTD.

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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 February 27, 1989 and granted May 3, 1995. A European patent lasts at most 20 years from filing, so its term ended February 27, 2009.
  • 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 August 27, 2014.
  • 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.
FiledFebruary 27, 1989
PublishedSeptember 27, 1989
GrantedMay 3, 1995
Term endedFebruary 27, 2009
Application numberEP 89301909
Classification (CPC)B01D53/0473

Timeline

Timeline From EPO dates

1990199219941996199820002002200420062008Application filedFeb 27, 1989PublishedSep 27, 1989Patent grantedMay 3, 1995Term endedFeb 27, 2009

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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