Access to communications systems
CA 2248490 C · Owner: Reader, David Jonathan · Inventors: Reader, David Jonathan; Freiberg, Lorenz; Cao, Qiang
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to communication systems in which end-user devices contend for access to shared resources of a channel in the communicationsystem. End-user devices sending data in packets over the communication channel piggyback requests for changes in allocated resources for transmission of another packet. A system controller changes the resource allocated to individual end-user devices depending upon the piggyback requests in order to optimise the throughput, of the channel. A packet switched network may thus act like a circuit switched network if required.
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 September 30, 1998 and granted August 27, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 30, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 30, 2020.
- 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.