Preparation of zns:cu,cl electroluminescent phosphor
CA 2360028 A1 · Owner: Northrop, Shellie K. · Inventors: Northrop, Shellie K.; Vaddi, Butchi Reddy
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for improving the half-life of ZnS:Cu,Cl electroluminescent phosphor wherein the, improvement comprises firing a previously first fired material comprised of ZnS:Cu,Cl with, a quantity of MgSO4.cndot.7H2O to form a second fired material. The quantity is from 0.015 to, 0.15 mole of MgSO4.cndot.7H2O/mole of ZnS.
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 October 25, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 25, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 25, 2023.
- 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.