Integrated service digital network subscriber line
CA 1250066 A · Owner: Fujitsu Limited · Inventors: Shimozono, Ryoji; Hatano, Takashi; Tanaka, Yasuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention provides an ISDN subscriber line comprising an exchange terminal sending a training pulse for frame synchronization and bit synchronization and, connected to receive signals from a host device. A network terminal is connected to the exchange terminal for providing signals to and receiving signals from the exchange terminal. Terminal equipment is connected to the network terminal and a discriminating circuit for discriminating maintenance signals is provided. The device further comprises a circuit for outputting the maintenance signals; and control means for selecting one of the maintenance signals to be output in accordance with one of a signal which provide instructions to …
Read the whole patent
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 February 14, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 14, 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.