Radio telecommunication apparatus
CA 2115901 C · Owner: Kasuya, Kisaburo · Inventors: Kasuya, Kisaburo; Ito, Koichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A radio telecommunication system has radio channels each, radio channel including a plurality of slots generated by time division. The system encompasses a plurality of areas having a base station which sends a first signal over a predetermined slot of the slots. If the signal quality of the first signal received by a portable apparatus is less than a criterion non-used at, least one of the slots is designated. The portable apparatus sends a second signal over the predetermined slot and the designated slot.
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 February 17, 1994 and granted February 23, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 17, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 17, 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.