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Expired European patentEurope

Optically operated electric transversal filter

EP 0531499 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 March 27, 1992 and granted June 16, 1999. A European patent lasts at most 20 years from filing, so its term ended March 27, 2012.
  • 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 September 27, 2017.
  • 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.
FiledMarch 27, 1992
PublishedMarch 17, 1993
GrantedJune 16, 1999
Term endedMarch 27, 2012
Application numberEP 92908236
Classification (CPC)G02B6/2861

Timeline

Timeline From EPO dates

1993199519971999200120032005200720092011Application filedMarch 27, 1992PublishedMarch 17, 1993Patent grantedJune 16, 1999Term endedMarch 27, 2012

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.