Patent Yard Sign in
European application, no grantEurope

Semiconductor laser having double heterostructure and method of producing the same

EP 0454476 A2 · Applicant: FUJITSU LIMITED

EPO PDF

Overview

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

Read the whole patent

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.

Google PatentsEPO PDF

Why it's free to use

  • Filed April 26, 1991 and never granted as a European patent. Had it been granted, its 20-year term would have ended April 26, 2011.
  • 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 26, 2016.
  • 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 26, 1991
PublishedOctober 30, 1991
GrantedNever granted
Term endedApril 26, 2011
Application numberEP 91303783
Classification (CPC)H01S5/10 +2 more

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedApril 26, 1991PublishedOct 30, 1991Term endedApril 26, 2011

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.