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Expired European patentEurope

Thermal-storage device using latent melting heat and direct contact

EP 0023866 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 July 30, 1980 and granted May 11, 1983. A European patent lasts at most 20 years from filing, so its term ended July 30, 2000.
  • 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 January 30, 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.
FiledJuly 30, 1980
PublishedFebruary 11, 1981
GrantedMay 11, 1983
Term endedJuly 30, 2000
Application numberEP 80401126
Classification (CPC)F28D20/025

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedJuly 30, 1980PublishedFeb 11, 1981Patent grantedMay 11, 1983Term endedJuly 30, 2000

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.