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Expired European patentEurope

Information transmission system, using direct light-modulation, optical-link and a bandwidth extended towards low frequencies and direct current

EP 0053545 B1 · Applicant: THOMSON-CSF

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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 November 20, 1981 and granted August 1, 1984. A European patent lasts at most 20 years from filing, so its term ended November 20, 2001.
  • 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 May 20, 2007.
  • 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.
FiledNovember 20, 1981
PublishedJune 9, 1982
GrantedAugust 1, 1984
Term endedNovember 20, 2001
Application numberEP 81401842
Classification (CPC)H04B1/62 +1 more

Timeline

Timeline From EPO dates

1982198419861988199019921994199619982000Application filedNov 20, 1981PublishedJune 9, 1982Patent grantedAug 1, 1984Term endedNov 20, 2001

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.