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Expired European patentEurope

Acousto-optic frequency shifter utilizing multi-turn optical fiber

EP 0190923 B1 · Applicant: THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIVERSITY

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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 February 5, 1986 and granted April 1, 1992. A European patent lasts at most 20 years from filing, so its term ended February 5, 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 August 5, 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.
FiledFebruary 5, 1986
PublishedAugust 13, 1986
GrantedApril 1, 1992
Term endedFebruary 5, 2006
Application numberEP 86300754
Classification (CPC)G02F1/0134

Timeline

Timeline From EPO dates

1987198919911993199519971999200120032005Application filedFeb 5, 1986PublishedAug 13, 1986Patent grantedApril 1, 1992Term endedFeb 5, 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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