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Expired European patentEurope

Method and system for spread spectrum transmission, especially for information transmission in an electric power distribution network

EP 0194902 B1 · Applicant: SCHLUMBERGER INDUSTRIES

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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 January 17, 1986 and granted August 7, 1991. A European patent lasts at most 20 years from filing, so its term ended January 17, 2006.
  • 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 July 17, 2011.
  • 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.
FiledJanuary 17, 1986
PublishedSeptember 17, 1986
GrantedAugust 7, 1991
Term endedJanuary 17, 2006
Application numberEP 86400089
Classification (CPC)H04L1/02 +2 more

Timeline

Timeline From EPO dates

1987198919911993199519971999200120032005Application filedJan 17, 1986PublishedSep 17, 1986Patent grantedAug 7, 1991Term endedJan 17, 2006

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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