Optical encoder
CA 1293548 C · Owner: Scott-Jackson, Dennis · Inventors: Skibbe, Harry; Scott-Jackson, Dennis
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical encoder having a concentric cylindrically disposed reticle and moving unit with each having alternating transparent and opaque regions. A light emitter is located in each of two windows on one side of the reticle and moving unit while a light sensor is located on the other. The spacing of transparent and opaque regions in the reticle relative to that in the moving unit is such that when the transparent regions in one window are aligned those in the other unit are sufficiently non-aligned to produce quadrature and enable detection of both motion and direction of motion.
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 December 24, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 24, 2008.
- 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.