A voice transmitting apparatus, a voice transmitting method, and a voice band signal transmitting system using the same apparatus or the same method
CA 2253209 C · Owner: Kawanobe, Takeshi · Inventors: Fuse, Hidetoshi; Hayano, Masashi; Kawanobe, Takeshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A voice band signal is compression-encoded at a voice compression-encoding portion and is assembled into a cell at a cell assembling portion. Conversely the voice band signal is disassembled at a cell disassembling portion and is decoded at a voice compression-decoding portion. When, from both of up and down data judging portions, receiving a judgement of coincidence of the voice band signal with a signal at the time when the line is unused, a timer counts a continuation time. When the continuation time exceeds a protection time, a protection time judging portion causes the cell assembling portion to stop the cell transmission. When, from either of the up and down data judging portions, …
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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 November 10, 1998 and granted April 1, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 10, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 10, 2020.
- 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
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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.