Linear motors and control circuitry therefor
CA 1197550 A · Owner: Kelly, Hugh-Peter G. · Inventors: Kelly, Hugh-Peter G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The relative position of the armature and stator of a linear motor is controlled using the outputs of two optical transducers 14 and 15 in phase quadrature from an optical graticule disposed along the length of the stator. An analogue, velocity-indicating signal is derived from the output of the photoelectric devices 14 and 15 which are also digitised and used to cycle an up/down counter 317 which produces as an output a ten-bit digital word representing the armature position. The outputs of this counter 317 are used as the ten higher order bits of the twelve-bit digital word representing the armature position which is compared by means of a comparator 316 with a demanded armature position. …
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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 December 3, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 3, 2002.
- 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.