Fiber-optic energy transmission monitor
CA 2255282 A1 · Owner: Jackson, John E. · Inventors: Peterson, Brian L.; Jackson, John E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Fiber-optic tap for monitoring light intensity in a fiber-optic cable (1) constructed by removing the buffer layer (4) and rough polishing the cladding layer (3) beneath so that light in the cladding layer (3) is emitted therefrom. A photodetector (13) is located in proximity with the polished surface (12) and optically isolated from other light sources. The signal produced by the photodetector (13) indicates the light intensity in the fiber. The signal produced by the photodetector (13) can trigger an alarm and can also be fed back to the light source to maintain the light intensity in the fiber (1). An array of photodetectors (13) can be provided in a unit to monitor multiple fibers (1).
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 December 4, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 4, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 4, 2020.
- 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.