Fm demodulator
CA 1287883 C · Owner: Ishii, Eiichi · Inventors: Ishii, Eiichi; Yoshizawa, Shigeo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A frequency modulation (FM) demodulator has a limiter for converting an input signal into a rectangular signal first, and second pulse generators and a low pass filter. The first pulse generator is responsive to the transition points of the rectangular signal for generating a first pulse train having first and a second states for the period of the rectangular signal. The first state has a predetermined period of time. The second pulse generator generates a second pulse train having third and fourth states for the period of the rectangular signal the duration of, the third state being reduced by a predetermined time length based on the duration of the second state of the first pulse train. …
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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 August 20, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 20, 2008.
- 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.