Modem for rf subscriber telephone system
CA 1324642 C · Owner: M/A-Com Linkabit, Inc. · Inventors: Paneth, Eric; Yehushua, Moshe; Critchlow, David N.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This is directed to a modulator for a modem. The modulator converts a bit stream, in which a predetermined number of bits form a symbol, into a phase modulated intermediate frequency (IF) signal. To perform this function the modulator, converts the bits of the bit stream that form symbols using phase locked DPSK. The phase modulated symbols are digitally filtered to produce a filtered signal that includes time shared digital, in-phase and quadrature-phase components that when converted to, an analog signal, provides a modulation signal of a frequency that is centered about a predetermined frequency and deviation from that frequency is according to the value of the phase modulated symbols. …
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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 November 23, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 23, 2010.
- 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.