Data demodulator
CA 2090367 C · Owner: Shibata, Takayuki · Inventors: Shibata, Takayuki; Ohmura, Hideo; Sato, Toshifumi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A data demodulator demodulates a differential phase-shift-keying (DPSK) modulated receive signal to produce symbol rate demodulated data. A phase detection means delay means, and phase difference detection means connected in cascade detect the phase of the receive signal and generate a phase difference signal having N-phases, in synchronism with respective clock signals. A decision means generates decision data on the basis of a phase range of the phase difference signal and a decision, error computing means computes a decision error on the basis of each phase of the phase difference signal and a corresponding decision phase of the decision data. Decision error adding means and respective …
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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 February 25, 1993 and granted September 30, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 25, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 25, 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.