Local multichannel distribution system including telephone line switching system
CA 2208397 A1 · Owner: Kamuro, Hirotaka · Inventors: Kamuro, Hirotaka
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
To increase reliability of telephone services in a local multichannel distribution system, a switching function to a bypass line is added not only to a terminal unit but also, to an entire system, and reliability of a line is increased by employing a microwave radio link and a public telephone line network. In a local multichannel distribution system capable of providing services of pictures data, and, telephones by highspeed wireless transmissions when a, failure happens to occur in a wireless line used to connect a base station to set top boxes, the set top boxes are connected to the public telephone line network as a first bypass line. When a failure happens to occur in a cable (coaxial …
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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 June 20, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 20, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 20, 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.