Wireless communication system incorporating multicast addressing and method for use
CA 2341512 C · Owner: Shaughnessy, Mark · Inventors: Kumar, Surender; Mathis, James E.; Derango, Mario F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A wireless communication system (200) comprises a connectionless packet network (201) coupled to a plurality of sites (203-208) that are in wireless communication with a plurality of subscriber units (210-217) logically arranged into a plurality of talk groups having corresponding talk group identifications. In one embodiment, each site maintains mappings (220-225) of at least one multicast address to at least one talk group identification. In another embodiment, individual subscriber units maintain such mappings (320). When a subscriber unit affiliates with a given site and talk group (501 601), the site identifies a multicast address corresponding to the talk group. Based on the …
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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 August 24, 1999 and granted December 3, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 24, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 24, 2021.
- 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
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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.