Remote control system having symmetrical tone send/receive signalling circuits for radio communications
CA 1231386 A · Owner: Motorola, Inc. · Inventors: Dolikian, Arman V.; Kotzin, Michael D.; Budnik, Brian J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, The remote control system having symmetrical signalling circuits for radio communications is coupled to a single wire line/audio channel 26 and permits two or more units, base stations 12 and/or remote consoles 14 to be coupled to the single wire line. Each signalling circuit comprises a wire line coupler 48 for coupling to the wire line 26, an audio input 46 line and an audio output 44 line. An automatic gain control circuit 56 is coupled between the wire coupler 48 and the audio output 44 line and a filter 104 and line driver 106 are coupled between the audio input 46 line and the wire coupler 48. A control unit 70 including a microprocessor 71 a tone, encoder 214, a tone …
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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
- Granted January 12, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 12, 2005.
- 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.