Electromagnetic devices
CA 1061392 A · Owner: Lucas Industries Limited · Inventors: Seilly, Alec H.; Mowbray, Dorian F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An electromagnetic device comprises an outer annular member and an inner member, the two members each having a helical rib on their presented surfaces. Two presented side faces of the ribs define working surfaces and on one of the working surfaces is defined a groove which extends the length of the rib and the groove accommodates an electrical winding which when energised creates a pair of magnetic poles on the one working surface. The magnetic circuit of the poles includes the other working surface and the two surfaces move towards each other to reduce the magnetic reluctance thereby causing relative movement of the members.
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
- Granted August 28, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 28, 1996.
- 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.