Fiber optic coupling filer and amplifier
CA 2056953 A1 · Owner: Corning Incorproated · Inventors: Hall, Douglas Warren; Hawk, Robert Martin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The disclosed fiber optic filter structure includes an optical fiber having a single-mode core surrounded by cladding material, and at least one light-attenuating light path in the cladding material uniformly spaced from the single-mode core. The propagation constants of the single-mode core and the light path are different at wavelengths except for at least one wavelength .lambda.f. The spacing between the single-mode core and the light path are sufficiently small that light within a first band of wavelengths centered around .lambda.f couples between the single-mode core and the light path. At least a portion of the light within the first band of wavelengths is absorbed in the light path. …
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 December 4, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 4, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 4, 2013.
- 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.