A laser
CA 2212736 C · Owner: British Telecommunications Public Limited Company · Inventors: Armitage, Jonathan Richard; Wyatt, Richard; Robertson, Michael James
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A laser comprising first and second feedback elements defining a laser cavity and a gain medium within the laser cavity the gain medium having first and , second facets (5 6) and an optical waveguide (8) for guiding optical radiation between said first and second facets wherein the second feedback , element is wavelength selective and the optical waveguide (8) is configured to direct optical radiation at an angle .theta. to the normal of the second facet (6).
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 March 7, 1996 and granted May 29, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 7, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 7, 2018.
- 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.