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Expired European patentEurope

Surface emitting laser

EP 0540239 B1 · Applicant: AT&T Corp.

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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 October 21, 1992 and granted October 11, 1995. A European patent lasts at most 20 years from filing, so its term ended October 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 April 21, 2018.
  • 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.
FiledOctober 21, 1992
PublishedMay 5, 1993
GrantedOctober 11, 1995
Term endedOctober 21, 2012
Application numberEP 92309620
Classification (CPC)H01S5/18341

Timeline

Timeline From EPO dates

1993199519971999200120032005200720092011Application filedOct 21, 1992PublishedMay 5, 1993Patent grantedOct 11, 1995Term endedOct 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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.