Optical power meter using low-current measurement circuit
CA 2194689 C · Owner: Poole, Craig D. · Inventors: Poole, Craig D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A battery or solar-powered, apparatus for measuring and displaying optical power transmitted through an, optical fiber. The apparatus has a measuring circuit comprising an optical detector (602), a current/voltage converter (704) and a control circuit (702) which provides timing signals and controls the power applied to the measuring circuit. The apparatus is secured within a housing (102) and is sufficiently small and light such that permanent, in-line, attachment to the optical fiber is possible. In a first embodiment a voltage, proportional to the measured optical power is available at an output jack (214), attached to the housing (102). The jack further comprises a switch (1760) which …
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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 April 30, 1996 and granted July 7, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 30, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 30, 2018.
- 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.