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Expired European patentEurope

Lithium alumino-silicate glass ceramics

EP 0156479 B1 · Applicant: GEC ALSTHOM LIMITED

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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 February 13, 1985 and granted April 12, 1989. A European patent lasts at most 20 years from filing, so its term ended February 13, 2005.
  • 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 August 13, 2010.
  • 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.
FiledFebruary 13, 1985
PublishedOctober 2, 1985
GrantedApril 12, 1989
Term endedFebruary 13, 2005
Application numberEP 85300940
Classification (CPC)C03C1/004 +1 more

Timeline

Timeline From EPO dates

1986198819901992199419961998200020022004Application filedFeb 13, 1985PublishedOct 2, 1985Patent grantedApril 12, 1989Term endedFeb 13, 2005

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.