Fiber-optic current sensor
CA 2345561 C · Owner: Abb Schweiz Ag · Inventors: Bohnert, Klaus
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A fiber-optic current sensor has a reflection interferometer having a fiber-optic supply lead (2) and a coil-shaped optical sensor fiber (1) the sensor fiber (1) being connected with a first end to the fiber-optic supply lead (2) and being provided at a second, free end with a reflector (10). The fiber-optic supply lead (2) has two fiber arms (20 21), which interconnect a detector-side and a sensor-side polarization-maintaining coupler (7 8). A phase modulator (9) for modulating differential phases of two polarized waves propagating in the supply lead fiber (2) is arranged in one of these two fiber arms (20 21), in which it modulates the differential phase of two waves polarized parallel to …
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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, 2001 and granted August 9, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 30, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 30, 2023.
- 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.