Method and apparatus for cordless infrared communication
CA 2249450 C · Owner: Wireless Communications Products, L.L.C. · Inventors: Saulnier, James L.; Crimmins, James W.; Gallo, Steven
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus for communicating from a base unit (40) to a plurality of portable infrared devices (48.1-48.8) are described using established communication protocols. The signals are sent along cables from the base unit via stationary infrared receiver/transmitter (RT 46.1-46.16) modules at , infrared carriers in standard transmission and receiving slots to and from the portable devices. The RT modules are distributed throughout a space in the building. Control circuits are used to assure that different infrared carrier signals, originating from nearby RT modules arrive at any one portable device , with a phase difference that does not exceed an acceptable amount. The system …
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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 March 19, 1997 and granted June 3, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 19, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 19, 2019.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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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.