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Expired European patentEurope

Division wavelength multiplexer/demultiplexer having an elliptical concave grating, and its use in integrated optics

EP 0275795 B1 · Applicant: COMMISSARIAT A L'ENERGIE ATOMIQUE

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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 December 28, 1987 and granted June 3, 1992. A European patent lasts at most 20 years from filing, so its term ended December 28, 2007.
  • 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 June 28, 2013.
  • 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.
FiledDecember 28, 1987
PublishedJuly 27, 1988
GrantedJune 3, 1992
Term endedDecember 28, 2007
Application numberEP 87402995
Classification (CPC)G02B6/12004 +2 more

Timeline

Timeline From EPO dates

1988199019921994199619982000200220042006Application filedDec 28, 1987PublishedJuly 27, 1988Patent grantedJune 3, 1992Term endedDec 28, 2007

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.