Expired Canadian patentCanada
Modulation signals for a satellite navigation system
CA 2537809 C · Owner: Owen, John Ivor Rewbridge · Inventors: Owen, John Ivor Rewbridge; Pratt, Anthony Richard
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
I Embodiments of the present invention relate to a modulation system in which an m-level, m>2, digital subcarrier is used to modulate a signal.
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 September 1, 2004 and granted August 8, 2017. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 1, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 1, 2026.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledSeptember 1, 2004
GrantedAugust 8, 2017
Term endedSeptember 1, 2024
Patent numberCA 2537809 C
Classification (IPC)H04B14/08 +2 more
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.