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Expired European patentEurope

Method for sealing carbon and graphite surfaces

EP 0370799 B1 · Applicant: UNION CARBIDE CORPORATION

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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 November 22, 1989 and granted March 17, 1993. A European patent lasts at most 20 years from filing, so its term ended November 22, 2009.
  • 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 May 22, 2015.
  • 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.
FiledNovember 22, 1989
PublishedMay 30, 1990
GrantedMarch 17, 1993
Term endedNovember 22, 2009
Application numberEP 89312144
Classification (CPC)C04B41/009 +2 more

Timeline

Timeline From EPO dates

1990199219941996199820002002200420062008Application filedNov 22, 1989PublishedMay 30, 1990Patent grantedMarch 17, 1993Term endedNov 22, 2009

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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