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Expired European patentEurope

Automatic liquid level regulator for superfluid helium contained within a reservoir

EP 0091850 B1 · Applicant: COMMISSARIAT A L'ENERGIE ATOMIQUE Etablissement de Caractère Scientifique Technique et Industriel

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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 March 25, 1983 and granted June 11, 1986. A European patent lasts at most 20 years from filing, so its term ended March 25, 2003.
  • 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 September 25, 2008.
  • 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.
FiledMarch 25, 1983
PublishedOctober 19, 1983
GrantedJune 11, 1986
Term endedMarch 25, 2003
Application numberEP 83400630
Classification (CPC)G01F23/00 +2 more

Timeline

Timeline From EPO dates

1984198619881990199219941996199820002002Application filedMarch 25, 1983PublishedOct 19, 1983Patent grantedJune 11, 1986Term endedMarch 25, 2003

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.