Safe class-2 motor control circuit and method adapted for electric vacuum cleaning system suction motor and agitator motor control
CA 2281318 C · Owner: Eleanor, Breslin E. · Inventors: Mccarthy, James J.; Breslin, John J. (Deceased)
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A control circuit is disclosed for selectively energizing an electrical device such as a central vacuum cleaning system motor coupled to the control circuit via a pair of conductive wires with an operating voltage. The control circuit has a circuit for selectively supplying and withholding operating electrical power to the electrical device. A first current detector is connected to a control voltage and senses a current flow resulting from closure of a circuit connected to a control voltage in at least one wire of the pair of conductive wires. A second current detector connected to the operating voltage senses a current flow resulting from closure of a circuit connected to the operating …
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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 September 3, 1999 and granted August 9, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 3, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 3, 2021.
- 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.