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Expired European patentEurope

Hydrogen liquefaction using a dense fluid expander and neon as a precoolant refrigerant

EP 0342250 B1 · Applicant: AIR PRODUCTS AND CHEMICALS, INC.

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Overview

The published document from the EPO: abstract, claims, description and drawings. Open it full size

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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 16, 1988 and granted January 7, 1993. A European patent lasts at most 20 years from filing, so its term ended May 16, 2008.
  • 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 16, 2013.
  • 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 16, 1988
PublishedNovember 23, 1989
GrantedJanuary 7, 1993
Term endedMay 16, 2008
Application numberEP 88107846
Classification (CPC)F25J1/0221 +2 more

Timeline

Timeline From EPO dates

1989199119931995199719992001200320052007Application filedMay 16, 1988PublishedNov 23, 1989Patent grantedJan 7, 1993Term endedMay 16, 2008

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.