Fiber-optic sensor with first and second bimode fibers
CA 2076579 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
In a fiber optic, sensor for measuring electric fields and voltages, in place of a bimode fiber extending between sensor head (14) and evaluation unit (13) two separate bimode fibers (4a, 4b) of the same type are connected in series in the manner of a tandem interferometer. The first bimode fiber (4a) is disposed, together with the sensor element (6) in the, sensor head (l4). The second bimode fiber (4b) is situated within the separate evaluation unit (13). In this way, the sensor head (14) and the evaluation unit (13) are connected only by insensitive monomode fibers (2a, 2b).
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 August 21, 1992 and granted January 2, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 21, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 21, 2014.
- 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.