Method and machine for finishing commutators
CA 2017514 C · Owner: Mccord Winn Textron Inc. · Inventors: Amey, Louis F. R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for finishing the full radial surface of a face type commutator includes relatively rotating the commutator on its axis with respect to a cutter to form a finish on the commutator face which includes radially inwardly cross hatch segments which become progressively open toward the outer periphery of the commutator and which end in a series of generally radially directed single line segments at the radially outer portion of each of the conductor segments of the commutator so as to dress slot edges during cutting to prevent formation of slot burrs; thereafter brushing the commutator face to remove loose chips therefrom followed by finishing the surface to remove irregularities …
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 May 24, 1990 and granted January 9, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 24, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 24, 2012.
- 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.