Optical device having two optical waveguides connected and a method of producing the same
CA 2104708 C · Owner: Sharp Kabushiki Kaisha · Inventors: Okada, Kuniaki; Kurata, Yukio; Yoshida, Yoshio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical device includes a first dielectric slab waveguide having an effective refractive index N1; a second dielectric slab waveguide having an effective refractive index N2; and a third dielectric slab waveguide having a length 1 and an effective refractive index N3 the third dielectric slab waveguide being formed between the first dielectric slab waveguide and the second dielectric slab waveguide so as to connect the first dielectric slab waveguide with the second dielectric slab waveguide optically; wherein the length 1 and the effective refractive index N3 substantially satisfy following equations; where .lambda. is a free-space wavelength of light traveling in the optical device …
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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 August 24, 1993 and granted June 10, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 24, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 24, 2015.
- 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.