Electric discharge machining apparatus
CA 2311765 C · Owner: Sano, Sadao · Inventors: Hosaka, Akio; Sano, Sadao
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An electric discharge machining comprising an electrode mounting device, (42) for mounting a tool electrode a quill (41) movable in the vertical , direction and having the tool mounting device attached to a lower end at least two linear , motor, movers (43 44) attached to the quill symmetrical about the central axis of the quill, at, least two linear motor stators (31 32), respectively opposite the at least two movers, and, a balance device (6) for balancing a gravitational force acting on the quill. The balance, device comprises an air cylinder (60) arranged coaxially with the quill so that a balance, force is aligned with the central axis of the quill. The air cylinder is preferably …
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 December 2, 1999 and granted August 6, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 2, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 2, 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.