Signal transmission and reception system
CA 1231384 A · Owner: Toyo Communication Equipment Co. Ltd. · Inventors: Koga, Daisuke; Naito, Yukio; Tamura, Masahide
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A transmission and reception system wherein a local oscillator of the receiver is dispensed with by using the output of a transmission oscillator modulated by a modulation signal in lieu of a local oscillator output of the receiver. The modulated component mixed as a result of employing the transmission oscillator as a local oscillator is canceled at a second mixer or mixers subsequent thereto as a result of modulation of the output of a second local oscillator or local oscillators subsequent thereto by said modulation signal level-adjusted and phase-shifted to required values respectively. In addition by applying, the modulated output of the transmission oscillator having been rid of 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
- 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.