Expired European patentEurope
A high frequency multichannel diversity differential phase shift (dpsk) communications system
EP 0527819 B1 · Applicant: SECRETARY OF STATE FOR DEFENCE IN HER BRITANNIC MAJESTY'S GOV. OF THE UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN IRELAND
Overview
The published document from the EPO: abstract, claims, description and drawings. Open it full size
Read the whole patent
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 April 30, 1991 and granted June 12, 1996. A European patent lasts at most 20 years from filing, so its term ended April 30, 2011.
- 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 October 30, 2016.
- 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.
FiledApril 30, 1991
PublishedFebruary 24, 1993
GrantedJune 12, 1996
Term endedApril 30, 2011
Application numberEP 91908550
Classification (CPC)H04L1/04 +1 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.