Carbon commutator
CA 2330103 A1 · Owner: Mccord Winn Textron Inc. · Inventors: Ziegler, William E.; Bauer, William A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A barrel or face-type carbon-segment commutator assembly (12c) for an electric motor includes a segmented commutating surface (22c) defined by an annular array of commutator sector (14c, 18c), each sector including a carbon segment (18c) connected to a respective conductor section (14c). To form the assembly an annular carbon cylinder (20c) is overmolded onto a copper blank (70c) and radial grooves (54c) are formed in an inside surface of the carbon cylinder opposite the communicating surface. An insulator hub (24c) is overmolded onto the carbon cylinder and into the radial grooves. Slots (56c) are then machined inward from the communicating surface to the insulator-filled grooves to …
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 30, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 30, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 30, 2021.
- 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.