Phase modulated fiber-optic gyroscope
CA 2011698 C · Owner: Okamoto, Kenji · Inventors: Okamoto, Kenji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a phase-modulated fiber-optic gyroscope having as essential components a fiber-optic cable having a sensor coil portion and a portion provided with a phase modulation device a light-emitting device that issues coherent light a beam, splitter by which the light issuing from the light-emitting device either directly or via an optical fiber is split into two beams which are launched at opposite ends of the fiberoptic cable, a light-receiving device into which the light beams that have been transmitted through the fiber-optic cable and that emerge from opposite ends thereof are launched after they are re-combined by the beam splitter and a synchronous, detector circuit that receives the …
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 March 7, 1990 and granted August 23, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 7, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 7, 2012.
- 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.