Source of electrical energy for a resistance-welding machine
CA 1183578 A · Owner: Schuler (L.) G.M.B.H. · Inventors: Belamaric, Zelimir
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An electrical power source for resistance welding apparatus is described. It is conventional in such a power source to use a static inverter and a welding transformer and to incorporate a static frequency converter usually solid state, which derives an output voltage having a frequency and pulse shape different from the voltage fed to the inverter. According to the invention, one or more parallel additional frequency converters are provided. The output voltages of all the frequency converters are added in phase synchronism in the primary circuit of the welding transformer. The use of at least two frequency converters permits very steep sided pulses to be obtained thus ensuring accurate weld …
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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
- Granted March 5, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 5, 2002.
- 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.