Synchronous selective signalling system
CA 2068994 C · Owner: Deluca, Michael Joseph · Inventors: Deluca, Michael Joseph; Moore, Morris Anthony; Willard, David Frank
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A paging signalling system communicates messages via a synchronous signal. The synchronous signal is divided into a plurality of frames (100) in which selective groups of pagers decode. A signal (102) within the frame (100) causes groups of pagers to decode in various frame (104, 106), wherein several groups of pagers may be combined into a signal frame to decode messages (110). Embodiments of the invention include first type of a plurality of groups of pagers each group having a common maximum, frame rate a second type of a single group of pagers having a unique maximum frame rate and a third type of a single group of, pagers having no maximum frame rate. The three types of groups may …
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 16, 1990 and granted January 12, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 16, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 16, 2012.
- 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.