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Expired European patentEurope

Apparatus and method for data transmission using two crossed polarisations of an electro-magnetic wave

EP 0279997 B1 · Applicant: THOMSON-CSF

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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 22, 1987 and granted April 27, 1994. A European patent lasts at most 20 years from filing, so its term ended December 22, 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 22, 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 22, 1987
PublishedAugust 31, 1988
GrantedApril 27, 1994
Term endedDecember 22, 2007
Application numberEP 87402954
Classification (CPC)H04B7/10 +2 more

Timeline

Timeline From EPO dates

1988199019921994199619982000200220042006Application filedDec 22, 1987PublishedAug 31, 1988Patent grantedApril 27, 1994Term endedDec 22, 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

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