Drive circuits for direct current electric motors
CA 1069170 A · Owner: Lansing Bagnall Limited · Inventors: Mott-Gotobed, Clive
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A circuit comprising a direct current motor having two parallel oppositely wound field windings a pair of, controlled rectifiers, each connected in series with a respective one of the said field windings. A commutating capacitor couples the controlled rectifiers and an astable, multivibrator are provided for applying gating signals to the two controlled rectifiers alternately for causing conduction of direct current through the two field windings in alternate complementary conduction periods.
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
- Granted January 1, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 1, 1997.
- 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.