Dual current sensing driver circuit
CA 2042389 A1 · Owner: Caterpillar Inc. · Inventors: Hoffman, John Paul
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
22-, Abstract of the Disclosure, Dual Current Sensing Driver Circuit A driver circuit (10) for an inductive load (12), such as a solenoid winding (16), includes flyback and energization current sensors (28,40) which respectively sense the current through the coil during flyback and energization. The flyback current sensor (28) includes a flyback current resistor (30) disposed in the flyback current path of the winding (16) for producing a flyback signal proportional to the flyback current. The energization current sensor (40) includes an energization current resistor (42) disposed within the energization current path of the winding (16). The energization current resistor (42) is adapted to …
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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 9, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 9, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 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.