Line access control apparatus and line access system
CA 2364597 A1 · Owner: Ishida, Keijiro · Inventors: Ishida, Keijiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A line control apparatus includes an incoming call detection circuit, announcement circuit PB, receiver, and switch. The incoming call detection circuit detects an incoming call made to an interactive voice response apparatus or network. When the incoming call detection circuit detects the incoming call the, announcement circuit requests, by voice sending of a, specific signal of a caller. The PB receiver discriminates whether the specific signal is received from the caller in response to the request from the announcement circuit. The switch connects the incoming call to the interactive voice response apparatus or network in accordance with a discrimination result from the PB receiver. A …
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 December 3, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 3, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 3, 2023.
- 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.