D-5 channel bank control structure and controller
CA 1315368 C · Owner: American Telephone And Telegraph Company · Inventors: Landry, Joseph Elide; Rhodes, David Craig; Nolan, Thomas Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to a circuit for encoding incoming user signals into an outgoing stream of digital words. Each digital word includes an outgoing parity bit. The current also decodes an incoming stream of digital words each including an incoming parity bit. The circuit is comprised of a first unit for sensing deviation of parity of the incoming stream of digital words; and a second unit for developing a parity for the outgoing stream of digital words responsive to the first unit.
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 February 4, 1991 and granted March 30, 1993. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 4, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 4, 2013.
- 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.