Data transmission systems
CA 1180407 A · Owner: Post Office · Inventors: Cantwell, Brian D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A monitoring apparatus for monitoring the access ports of a viewdata computer comprises a microprocessor and associated RAM. Information indicative of the condition of the access ports is fed into the RAM under the control of the microprocessor via input/output latches which are linked to the ports. An interface circuit periodically assembles a message relating to the condition of a port as indicated by the information stored in the RAM for transmission to a monitoring centre where the information can be displayed on a conventional viewdata terminal.
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 January 2, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 2, 2002.
- 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.