Single mode optical fiber
CA 1252657 A · Owner: American Telephone And Telegraph Company · Inventors: Lenahan, Terrence A.; Glodis, Paul F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract A single mode optical fiber comprises a core (e.g. 10), a first cladding (e.g. 11) surrounding the core, and a second cladding (e.g. 12) surrounding the first cladding. It also comprises a third cladding region (or index "ring") (e.g. 13). The core has radius a and refractive index nc, the first, second and third, cladding regions have inner radii R1i, R2i, and R3i, outer radii R1o, R2c and, R3o, and indices n1, n2, n3, respectively. The fiber has n1 < n3, R1o < R3i, R3o <, R2i. In preferred embodiments a = R1i, R1o = R3i, R3o = R2i. Appropriate choice of ring parameters can result in a lowering of the cut-off wavelength of the fiber, or in fiber that is less sensitive 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
- Granted April 18, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 18, 2006.
- 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.