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Expired European patentEurope

Process for making a tempered glas dielectric material for an electical isolator, and isolator obtained

EP 0078488 B1 · Applicant: CERAVER Société anonyme dite:

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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 October 26, 1982 and granted April 23, 1986. A European patent lasts at most 20 years from filing, so its term ended October 26, 2002.
  • 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 April 26, 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.
FiledOctober 26, 1982
PublishedMay 11, 1983
GrantedApril 23, 1986
Term endedOctober 26, 2002
Application numberEP 82109874
Classification (CPC)C03C21/00

Timeline

Timeline From EPO dates

1983198519871989199119931995199719992001Application filedOct 26, 1982PublishedMay 11, 1983Patent grantedApril 23, 1986Term endedOct 26, 2002

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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