Radio range finder
CA 2190940 C · Owner: Coveley, Solbyung · Inventors: Coveley, Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A radio range finding system (10) includes a radio range finder (12) and a plurality of remote mobile transponders (14). The radio range finder (12) transmits a signal modulated with an address code identifying a particular mobile transponder. When a mobile transponder receives the modulated signal (Ms) transmitted by the radio range finder and the modulated signal has been modulated with an address code that corresponds to the address assigned to that mobile transponder, the mobile transponder transponds a return signal (Rs) to the radio range finder. A receiver (32) in the radio range finder conveys the received signal to a mixer (30) which also receives an internal carrier …
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 31, 1995 and granted December 9, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 31, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 31, 2017.
- 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.