Ultra-thin layer alkaline earth metals as stable electron-injecting cathodes for polymer light emitting diodes
CA 2293803 A1 · Owner: Cao, Yong · Inventors: Cao, Yong
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention pertains generally to the field of light-emitting diodes LEDs. , More particularly, this invention relates to polymer LEDs which offer high brightness, high efficiency, and extended operating life and which comprise: , a transparent hole-injecting anode layer (11); an emissive layer comprising an electroluminescent polymer (12); and an electron-injecting cathode layer (13); the cathode layer comprises an ultra-thin layer of alkaline earth metal such , as calcium, strontium, and barium having a thickness of about 100 Angstroms or less, typically from about 15 to about 100 Angstroms.
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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 May 11, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 11, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 11, 2020.
- 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.