Waveguide element, waveguide branch or coupler element and waveguide integrated circuit
CA 2238232 C · Owner: Nec Corporation · Inventors: Kato, Tomoaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A waveguide element is capable of realizing acute waveguide discontinuity, such as a right angle bending (L-shaped bending) or branching (T-shaped branching). Two single mode waveguides having the identical cross-sectional structure form a waveguide discontinuity where center axes thereof extending in the longitudinal direction intersect with each other at an angle .theta. (0<.theta. ~ 90°). A leaky wave propagation region in a form of a lozenge shape having a length of one edge of L is located in the vicinity of a point where the center axes extended in the longitudinal directions of respective incident side and side single mode waveguides with an, effective propagation wavelength of a …
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 May 20, 1998 and granted January 8, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 20, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 20, 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.