Electric arc welding power supply
CA 1063182 A · Owner: Lincoln Electric Company (The) · Inventors: Overman, John A.; Golonka, Kenneth A.; Carroll, John E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A three phase electric arc welding power supply using SCR rectifiers for output control which has improved output characteristics, fault protection and current and voltage controls. The main power transformer is connected in a double wye with the neutral points interconnected by a pair of independent interphase inductances in series the mid point forming, one of the output terminals. Increased phaseback of the SCR's may be effected without the use of additional inductance in the output circuit. The fault protection circuit has a timecurrent trip curve closely approximating the time-current overload curve of the SCR's whereby the minimum size SCR's for a given maximum current output is …
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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 September 25, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 25, 1996.
- 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.