Surface treatment of phosphor particles and method for a crt screen
CA 2003752 C · Owner: Thompson, Robert Paul · Inventors: Thompson, Robert Paul; Friel, Ronald Norman; Datta, Pabitra
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The method of surface-treating dry-powdered phosphor particles for use in manufacturing a luminescent viewing screen for a CRT, to control the triboelectric charge characteristics of the phosphor particles includes the steps of, dissolving a suitable quantity of a polymeric coupling agent in a suitable solvent to form a mixture,surface-treating the phosphor particles by adding them to the mixture to provide a coating of the the coupling agent thereon, and then drying the surface-treated phosphor particles. The resultant dry-powdered surface-treated phosphor particles are used to make screen. The coupling agent controls the triboelectric charge characteristics of the phosphor …
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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 November 23, 1989 and granted January 16, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 23, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 23, 2011.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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.