Arc welding apparatus with constant current and voltage characteristics
CA 2243258 C · Owner: Yasuhara, Yoshimichi · Inventors: Okubo, Masayuki; Naruto, Masafumi; Yasuhara, Yoshimichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An arc welding apparatus having output terminals of a constant current characteristic and a constant voltage characteristic is provided at low cost with a reactor appropriate for both characteristics. A current control circuit 2 controls a secondary output current of a welding transformer 1 by means of a current control device while a first reactor 3 and a second reactor 4 are constructed so that magnetic flux formed by a first winding 3a and magnetic flux formed by a second winding 4a which are wound around an annular iron core 7 overlap each other. The other terminal of the first reactor 3 is connected to a constant current characteristic output terminal 8 while the other terminal of the …
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 July 15, 1998 and granted April 24, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 15, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 15, 2020.
- 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.