Method and apparatus for electronically controlling the output of a generator driven welding power supply
CA 2184773 C · Owner: Illinois Tool Works Inc. · Inventors: Smith, Alan F.; Bunker, Thomas A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus for providing a welding output is disclosed. The apparatus includes an ac generator having a field winding, a welding output winding and an electronic field controller connected to the field winding. The controller receives a current feedback signal and a voltage feedback signal and shapes the output curve in response to the desired output command signals. According to one embodiment the controller also receives a field current feedback signal. The controller may shape the output curves to emulate a DC generator for example by, causing the welding output V-A curves to have multiple breakpoints and/or a substantially preset slope over a welding range wherein the preset …
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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 4, 1996 and granted December 21, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 4, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 4, 2018.
- 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
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.