Expired Canadian patentCanada
Visible light emitting diodes fabricated from soluble semiconducting polymers
CA 2105069 C · Owner: Braun, David · Inventors: Braun, David; Heeger, Alan J.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Visible light LEDs are produced having a layer of conjugated polymer which is cast directly from solution or formed as a gel-processed admixture with a carrier polymer. The LEDs can be formed so as to emit polarized light.
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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 February 14, 1992 and granted February 2, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 14, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 14, 2014.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledFebruary 14, 1992
GrantedFebruary 2, 1999
Term endedFebruary 14, 2012
Patent numberCA 2105069 C
Classification (IPC)H10K71/10 +2 more
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.