Communication system using unbalanced communication paths
CA 1284845 C · Owner: Kabushiki Kaisha Toshiba · Inventors: Akita, Yoshihiro; Sato, Yasuji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A signal communication apparatus is used for a telephone system having a plurality of unbalanced communication paths. A feedback line of each unbalanced communication path is connected to a ground level and each unbalanced communication path including a phase reversing transformer. The phase reversing transformer produces two induced currents in the connected path if a speech signal is transmitted through another path. The induced currents are cancelled due to mutual interference.
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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
- Granted June 11, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 11, 2008.
- 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.