Variable speed control switch for an electric tool including a dc motor
CA 1270511 C · Owner: Aoi, Tatsuo · Inventors: Kiyono, Yasuhiro; Nagata, Kunio; Honda, Sueaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In this variable speed control switch for an electric tool including a DC motor which has an armature circuit there are, included: a device for turning on and off the armature circuit; an upper heat dissipation cover which covers the top of the turning off and on device; a lower heat dissipation cover which covers the bottom of the turning off and on device; a printed circuit board located on a lower surface of the lower cover and carrying a control circuit imprinted on it; a resistor element provided on a lower surface of the board and included in a speed variation control circuit for the motor; a movable contact assembly including a first contact, member for short circuiting terminals of …
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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 June 19, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 19, 2007.
- 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.