Expired European patentEurope
A technique for repelling carriers in optical communications to minimize mutual interference
EP 0281306 B1 · Applicant: AT&T Corp.
Overview
The published document from the EPO: abstract, claims, description and drawings. Open it full size
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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.
Why it's free to use
- Filed February 24, 1988 and granted January 26, 1994. A European patent lasts at most 20 years from filing, so its term ended February 24, 2008.
- 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 24, 2013.
- 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 24, 1988
PublishedSeptember 7, 1988
GrantedJanuary 26, 1994
Term endedFebruary 24, 2008
Application numberEP 88301556
Classification (CPC)H04B10/50 +2 more
Timeline
Timeline From EPO dates
Sources & verification
Official EPO records
Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.