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Expired European patentEurope

Process for producing deuterium-enriched water during the production of hydrogen

EP 0047357 B1 · Applicant: GEBRÜDER SULZER AKTIENGESELLSCHAFT

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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 May 23, 1981 and granted May 25, 1983. A European patent lasts at most 20 years from filing, so its term ended May 23, 2001.
  • 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 23, 2006.
  • 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 23, 1981
PublishedMarch 17, 1982
GrantedMay 25, 1983
Term endedMay 23, 2001
Application numberEP 81103969
Classification (CPC)C01B5/02

Timeline

Timeline From EPO dates

1982198419861988199019921994199619982000Application filedMay 23, 1981PublishedMarch 17, 1982Patent grantedMay 25, 1983Term endedMay 23, 2001

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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