Digital communication network architecture for providing universal information services
CA 1254978 A · Owner: American Telephone And Telegraph Company · Inventors: Spicer, David A.; Lidinsky, William P.; Lehman, Harvey R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract:, A switched integrated wideband and narrowband multiservices digital network is an ISDN providing universal information services based on wideband and narrowband voice, data, and video communications. It comprises a plurality of service areas each served by a, central switching node. The central node is connected to a plurality of remote nodes by feeder optical fibers and a control bus extension. Network interface equipment at subscribers' premises is connected to remote nodes by distribution optical fibers. Each distribution fiber is wavelength-division multiplexed and carries modulated (pulse-analog, pulse-code, or differential pulse-code) wideband digital channels and a …
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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 May 30, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 30, 2006.
- 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.