Determining position with light
CA 2001368 A1 · Owner: Mcbrien, Gregory J. · Inventors: Mcbrien, Gregory J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Determining Position With Light The invention teaches determining position with light by providing amplitude modulated input light at an input light port of an optical cavity having a variable length dimension, detecting light at an output light port of the optical cavity and varying the frequency of amplitude modulation until a peak is detected. The maximizing frequency can then be related to the length of the cavity. The cavity may comprise an optical fiber inserted into a variable length cavity filled with a liquid having an index of refraction which matches that of the fiber. Mirrors may be placed at either end of the cavity. H1910-GC, - 24 -
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 October 24, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 24, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 24, 2011.
- 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.