Telephone answering machine
CA 2201984 C · Owner: Katoh, Hideki · Inventors: Katoh, Hideki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An object of the invention is to provide for a telephone answering machine which reduces a charge for a call. In a telephone answering machine 15 a caller ID, extracting part 6 analyzes a call incoming signal and extracts an area code as ID information regarding a caller. A transmission period memory part 11 stores area codes and transmission periods per unit charge in correlation to each other in advance. An ID checking part 7 checks the area code extracted by the caller ID extracting part 6 against the area codes stored in advance in the transmission period memory part 11, and a transmission period reading part 8 reads the transmission period which corresponds to the matching area code, …
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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 April 7, 1997 and granted August 8, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 7, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 7, 2019.
- 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.