Current sensing circuit and telephone line interface card with enhanced current sensing circuit
CA 2322934 A1 · Owner: Mcginn, Donald Scott · Inventors: Bisson, Robert L.; Handforth, Martin R.; Mcginn, Donald Scott
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An enhanced current sensing circuits, particularly suitable for use in telephony line interface cards is disclosed. The current sensing circuit includes a voltage sense circuit and sense amplifier that may be tuned for feed resistors of a given value to sense current through these feed resistors. Nominal values for the feed resistors are not required. A preferred voltage sense circuit includes a voltage dividing circuit connected across an impedance through which current is to be sensed. The voltage dividing circuit includes a tap to provide a voltage proportional to a voltage across the impedance, divided by a factor equal to a known multiple of the impedance. This sensed voltage may be …
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 October 11, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 11, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 11, 2022.
- 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.