Frequency synchronized bidirectional radio system
CA 2126102 C · Owner: Domestic Automation Company, Inc. · Inventors: Fulton, Forrest F.; Davidov, Mircho A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A bidirectional radio system for low cost high through-put accumulation of , data from a large number of site units. The site units are connected to remote radio transceivers in radio communication with a plurality of base stations (44). Accurate frequency synchronization allows multiple carriers within a 12.5 kHz FCC bandwidth. Frequency synchronization is achieved at !!ow cost by transmitting a high accuracy carrier and clock signal at a base station and , using receiving circuitry (54) at remote stations to extract the base clock signal and base carrier frequency and a phase-lock loop (258 and 248) to stabilize the remote station carriers. The reception circuitry at a remote station …
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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 January 8, 1993 and granted July 29, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 8, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 8, 2015.
- 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.