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Expired European patentEurope

Light emission element using a polycrystalline semiconductor material of III-V group compound and manufacturing method therefor

EP 0510587 B1 · Applicant: CANON KABUSHIKI KAISHA

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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 April 21, 1992 and granted March 12, 1997. A European patent lasts at most 20 years from filing, so its term ended April 21, 2012.
  • 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 October 21, 2017.
  • 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.
FiledApril 21, 1992
PublishedOctober 28, 1992
GrantedMarch 12, 1997
Term endedApril 21, 2012
Application numberEP 92106815
Classification (CPC)H10P14/3421 +2 more

Timeline

Timeline From EPO dates

1993199519971999200120032005200720092011Application filedApril 21, 1992PublishedOct 28, 1992Patent grantedMarch 12, 1997Term endedApril 21, 2012

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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