Full-duplex video communication system
CA 2071951 C · Owner: Tanenbaum, Richard · Inventors: Tanenbaum, Richard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Each terminal (30, 60) in a full-duplex communication system comprises a computer-controlled display screen such as a CRT (62, 32), at least one input means such as a keyboard (64, 34), a mouse (36 66) or a, light pen (38, 68) and bidirectional communication means (40, 70) through which the terminals (30 60) are, interconnected. Each communication means comprises a receiver (78, 48) for receiving display information received at the terminal from the remote terminal(s) and a transmitter (46, 76) for transmitting information to the remote terminal(s) where it is displayed. In accordance with the invention, each terminal also comprises control (50, 180) which periodically reads its input means …
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
- Filed December 13, 1990 and granted March 12, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 13, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 13, 2012.
- 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.