Dc arc torch power supply
CA 2085594 A1 · Owner: Electricity Commission Of New South Wales (The) · Inventors: Campbell, Brian
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A dc power supply (1) for a dc arc torch comprising: a controlled switch (2) and an inductance (3) connected in series in use, in, circuit with a source of direct current and an arc torch (6); a free-wheeling diode (9) connected, in use to be reverse biased, when the switch (2) is ON and forward biased when the switch (2) is OFF to maintain current flow through the arc and the inductance; a switch driver (10) to cycle the switch ON and OFF; and a feedback circuit (11) having a current sensor (12) associated with the circuit and connected to the switch driver (10) to control the duty ratio of the switch in accordance with the current flowing through the arc.
Read the whole patent
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 June 13, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 13, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 13, 2013.
- 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.