Electric discharge machining apparatus
CA 2311745 C · Owner: S & O Co. Ltd. · Inventors: Seki, Yoichi; Sano, Sadao; Hosaka, Akio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An electric discharge machining apparatus comprises a quill. (8) movable in the vertical direction, at least one set of linear motor movers attached to the quill symmetrically about a central axis of the quill and, a single set of linear motor stators facing the set of movers. An electrode mounting device (9) for holding a tool electrode (6) is attached to a lower end of the quill, and coaxially with the quill. Preferably the, set of movers includes magnetic plates (12 14) attached to the quill and, a row of permanent magnets (11 13, 15, 16) arranged on the magnetic, plates and the set of stators includes a yoke (31 41) and a coil (32, 42), wound around the yoke. The quill has a hole (8a) …
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 November 17, 1999 and granted August 6, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 17, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 17, 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.