Vertical geometry light emitting diode with group iii nitride active layer and extended lifetime
CA 2200305 C · Owner: Bulman, Gary E. · Inventors: Kong, Hua-Shuang; Bulman, Gary E.; Edmond, John Adam
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A light emitting diode (20) emits in the blue portion of the visible spectrum and is characterized by an extended lifetime. The light emitting diode comprises a conductive silicon carbide substrate (21); an ohmic contact (22) to the silicon carbide substrate; a conductive buffer layer (23) on the substrate and selected from the group consisting of gallium nitride aluminum , nitride, indium nitride, ternary Group III nitrides having the formula AxB1xN, where A and B are Group III elements and where x is zero one, or a , fraction between zero and one and alloys of silicon carbide with such ternary Group III nitrides; and a double heterostructure (24) including a p-n junction on the …
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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 September 19, 1995 and granted June 17, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 19, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 19, 2017.
- 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
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.