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Expired European patentEurope

Frequency-selective optical switch using polarization rotation

EP 0701710 B1 · Applicant: BELL COMMUNICATIONS RESEARCH, INC.

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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 26, 1994 and granted August 16, 2001. A European patent lasts at most 20 years from filing, so its term ended May 26, 2014.
  • 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 26, 2019.
  • 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 26, 1994
PublishedMarch 20, 1996
GrantedAugust 16, 2001
Term endedMay 26, 2014
Application numberEP 94918143
Classification (CPC)G02B6/2713 +2 more

Timeline

Timeline From EPO dates

1995199719992001200320052007200920112013Application filedMay 26, 1994PublishedMarch 20, 1996Patent grantedAug 16, 2001Term endedMay 26, 2014

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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