Apparatus for the optical heterodyne reception of signals
CA 2055309 C · Owner: Heidemann, Rolf · Inventors: Heidemann, Rolf
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a heterodyne receiver preferably for, multichannel reception especially for the reception of optical signals, in which the received signal is mixed with an oscillator signal of an oscillator in a mixing stage to generate an, intermediate frequency in an intermediate frequency stage (IF stage). According to the invention, the frequency (f LO) of the oscillator is tuneable discontinuously in jumps (Sp 1 Sp 2), and, the intermediate frequency stage is tuneable continuously.
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 November 12, 1991 and granted October 5, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 12, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 12, 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.