Improved pwm control for electric motor driven piston paint pumps
CA 2126338 C · Owner: Wagner Spray Tech Corporation · Inventors: Carlson, Dennis A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A control apparatus (10) controlling the operation of a pulse width modulator for an electric clutch (32) in portable spray painting equipment (13) having a pressure transducer (18) for sensing the pressure a manually adjustable pressure reference (23) a comparator type error detector (22), and a pressure deadband control (22) for inserting a deadband in a pressure control loop with the deadband varying as the pressure reference varies. A fixed deadband is provided below a predetermined low pressure setting to avoid excessive cycling of the control apparatus (10) during low pressure operation. The pulse width modulator control circuit includes compensation input power factor. The clutch …
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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 March 3, 1993 and granted December 15, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 3, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 3, 2015.
- 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.