Communications system with contention protocol
CA 2019698 A1 · Owner: Serfaty, Salomon · Inventors: Serfaty, Salomon; Mishory, Moshe; Cohen, Yitzhak
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Communications System with Contention Protocol Abstract, A communications system for data aquisition and control is provided, communicating on a time-division multiple-access communications channel, such as a radio channel. Time on the channel is divided between first periods (contention time) during which a central station receives signals from remote stations and second periods (polling time) when signals are transmitted to the remote units to grant acess to the channel. Means are provided for transmitting a signal to the remote units to inform the remote units of a change in the length of at least the first periods of time in response to traffic measuring means.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed June 22, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 22, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 22, 2012.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.