D-shaped waveguide and optical coupler using the waveguide
CA 2444843 C · Owner: Weatherford/Lamb, Inc. · Inventors: Sullivan, James; Putnam, Martin A.; Sanders, Paul
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A large diameter D-shaped optical waveguide device (9) includes an optional , circular waveguide portion (11) and a D-shaped waveguide portion (10) having at least one core (12) surrounded by a cladding (14). A portion of the waveguide device (9) has a generally D-shaped cross-section and has transverse waveguide dimension (d2) greater than about 0.3 mm. At least one Bragg grating (16) may be impressed in the waveguide (10) and/or more than one grating or pair of gratings may be used and more than one core may be used. The device (9) provides a sturdy waveguide platform for coupling ligth into and out of waveguides and for attachment and alignment to other waveguides for single , and …
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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 March 15, 2002 and granted May 7, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 15, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 15, 2024.
- 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.