Coil winding armatures with parallel coils
CA 2040609 C · Owner: Gifford, Carl · Inventors: Gifford, Carl; Dyke, Colin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of winding a motor armature (162) includes providing a sub-assembly comprising a shaft (170) having an armature core (164) and a commutator (168) mounted thereon, the commutator having commutator bars (172) spaced apart about the shaft (170) with each bar having leading and trailing wire connection devices (178) angularly spaced apart with respect to said shaft (170). A first wire (80) is connected to a leading wire connection device (91) and a second wire (82) is connected to a leading connection device (95) on the other side of the commutator. Successive coils (60, 62; 64 66) are, separately wound on the armature core from the first and second wires (80, 82) with connection of …
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 April 16, 1991 and granted May 14, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 16, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 16, 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.