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Expired European patentEurope

Silicon carbide:metal carbide alloy semiconductor

EP 0346464 B1 · Applicant: Hughes Aircraft Company

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Overview

The published document from the EPO: abstract, claims, description and drawings. Open it full size

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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 21, 1988 and granted October 7, 1992. A European patent lasts at most 20 years from filing, so its term ended November 21, 2008.
  • 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 21, 2014.
  • 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 21, 1988
PublishedDecember 20, 1989
GrantedOctober 7, 1992
Term endedNovember 21, 2008
Application numberEP 89902704
Classification (CPC)H10P14/2901 +2 more

Timeline

Timeline From EPO dates

1989199119931995199719992001200320052007Application filedNov 21, 1988PublishedDec 20, 1989Patent grantedOct 7, 1992Term endedNov 21, 2008

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.