Demodulation reference signal source
CA 2085122 C · Owner: Honeywell Inc. · Inventors: Dankwort, Rudolf; Dane, Preston; Blake, James
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An information retrieval system for extracting information from a pair of substantially coherent electromagnetic waves represented by phase therebetween each of which is incident on a photodetector, and having a demodulator which receives the photodetector output signal and which also recxives a reference signal. The reference signal is obtained through use of a phase shift detector which receives the photodetector signal to determine certain phase shifts occurring therein and provides this information to a reference signal supply to adjust the phase of its output signal which then serves as the reference signal for the demodulator.
Read the whole patent
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 June 13, 1991 and granted January 16, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 13, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 13, 2013.
- 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.