Position detector
CA 2078726 A1 · Owner: Nose, Noriyuki · Inventors: Saitoh, Kenji; Hasegawa, Masanobu; Sentoku, Koichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A position detector includes a diffraction grating provided on the surface of an object, an illumination system for illuminating the diffraction grating a detection system, for detecting diffracted light diffracted from the diffraction grating, and a processing system for detecting positional information relating to the object The, illumination system emits a first pair of beams which are diffracted by the diffraction grating and interfere with each other, and emits a second pair of beams which are diffracted by the diffraction grating and also interfere with each other. The first pair of beams are incident upon the diffraction grating along a plane extending in a first direction in which …
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 September 21, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 21, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 21, 2014.
- 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.