Personal handy phone system
CA 2177661 C · Owner: Fujii, Shigeo · Inventors: Fujii, Shigeo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a personal handy phone system, a private PHS base station is communicable with both a private PHS terminal and a public PHS terminal. The private PHS base station intermittently transmits and receives a first control signal having a first frequency in a predetermined cycle and at a predetermined interval to communicate with the private PHS terminal. The private PHS base station intermittently transmits and receives a second control signal having a second frequency different from the first frequency in the predetermined cycle and at the predetermined interval to communicate with the public PHS terminal when the first control signal is neither transmitted nor received.
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 29, 1996 and granted October 12, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 29, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 29, 2018.
- 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.