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Expired European patentEurope

Method and device for stabilizing the light power carried by an optical fibre

EP 0028669 B1 · Applicant: Philips Kommunikations Industrie AG

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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 May 16, 1980 and granted January 25, 1984. A European patent lasts at most 20 years from filing, so its term ended May 16, 2000.
  • 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 November 16, 2005.
  • 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.
FiledMay 16, 1980
PublishedMay 20, 1981
GrantedJanuary 25, 1984
Term endedMay 16, 2000
Application numberEP 80102701
Classification (CPC)H04B10/564 +2 more

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedMay 16, 1980PublishedMay 20, 1981Patent grantedJan 25, 1984Term endedMay 16, 2000

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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