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Expired European patentEurope

Improvements in or relating to liquid ring machines

EP 0474697 B1 · Applicant: Pedersen, John Rendell Conrad

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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 30, 1990 and granted October 20, 1993. A European patent lasts at most 20 years from filing, so its term ended May 30, 2010.
  • 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 30, 2015.
  • 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 30, 1990
PublishedMarch 18, 1992
GrantedOctober 20, 1993
Term endedMay 30, 2010
Application numberEP 90908294
Classification (CPC)F04C19/002

Timeline

Timeline From EPO dates

1991199319951997199920012003200520072009Application filedMay 30, 1990PublishedMarch 18, 1992Patent grantedOct 20, 1993Term endedMay 30, 2010

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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