Duplex system of transmission lines in a loop network
CA 1323081 C · Owner: Hasegawa, Mitsuyo · Inventors: Iwagaki, Yutaka; Hasegawa, Mitsuyo; Kobayashi, Kenzo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a duplex system of transmission lines in a loop network applied, for example to a local area, network. To realize an autonomous recognition of transmission line faults by each communication mode and to enable a rapid and automatic reconstruction of a network, each communication mode comprises a loop back circuit for effecting a loop back operation in response to a predetermined state of signals received from two directions of the duplex loop lines, and a return indication circuit for adding to a sent signal a return indication that a received signal was returned when the received signal could not be passed through the mode.
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 October 12, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 12, 2010.
- 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.