Telephone system
CA 2007446 C · Owner: Kabushiki Kaisha Toshiba · Inventors: Shimanuki, Masanobu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is provided a telephone system including a recording/reproducing section for recording an answering message to be transmitted to a calling subscriber and for reproducing the answering message, wherein a predetermined command from the calling subscriber is received through a telephone line during sending of the reproduced answering message to the telephone line a, predetermined operation is executed in correspondence with the command. In this telephone system there are, provided sections (25, 107) for generating a soundless period discrimination signal indicating a soundless period of the answering message at the time of recording the answering message, and command reception sections …
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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 January 4, 1990 and granted June 28, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 4, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 4, 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.