Radio beacon phase modulator for search and rescue satellite-aided tracking
CA 2123333 C · Owner: Northern Airborne Technology Ltd. · Inventors: Bennett, Steven John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A phase modulator for a position indicated radio beacon for use in search and rescue satellite-aided tracking which includes a digital memory circuit having a plurality of sets of stored numerical amplitude values with each set corresponding to a sine wave of a given phase and with at least three values in each set. A selection circuit selects phase values from the memory circuit in steps between a predetermined angular range in response to input data and for each phase, value, transfers the set of amplitude values in series at spaced apart time intervals to a digital-to-analog converter. A high frequency filter has an input coupled to an output of the digital-to-analog converter such that …
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 May 11, 1994 and granted July 14, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 11, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 11, 2016.
- 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.