Logic tracking interface circuit
CA 2016407 C · Owner: Bell-Northern Research Ltd. · Inventors: Wolczanski, John Anthony
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A logic tracking interface circuit includes a signal comparator, a feedback comparator and a logic gate of the type to be driven by the interface circuit. The mean of the inverting and noninverting outputs of the signal comparator is applied as an input to the feedback comparator, the other input being provided by the logic gate. The inverted output of the feedback comparator is used to control the common mode of the signal comparator.
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 May 9, 1990 and granted August 6, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 9, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 9, 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.