System for accurately detecting changes in temperature and pressure
CA 2055790 A1 · Owner: Chang, David B. · Inventors: Vali, Victor; Brownrigg, Patrick C.; Chang, David B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A system adapted for attachment to a device that undergoes changes in temperature and pressure and for, detecting changes in temperature and pressure in the device comprises a mechanism for attaching the system to the device and an optic device that includes pressure-responsive temperature-responsive optic fiber that produces signals representative of temperature changes over a first optical frequency band, and of pressure changes over a second distinctly different optical frequency band or two or more, optical devices, at least one including a pressureresponsive optic fiber, and at least one including a temperature-responsive optic fiber.
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 November 18, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 18, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 18, 2013.
- 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.