Phosphorescent materials
CA 1087467 A · Owner: Post Office (The) · Inventors: Spratling, Rodney E.; Walker, Aubrey D.; Ferro, Berkeley M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention is a process for rendering at least part of a surface phosphorescent. The process involves applying to the surface a composition comprising a solution of a phosphorescence activator and a soluble precondensate. The precondensate is obtained by a reaction between formaldehyde and an amino compound, is capable of further reaction in the absence of the phosphorescence activator to form an insoluble condensation product that does not substantially absorb ultraviolet radiation at any wavelength at which the phosphorescence activator substantially absorbs ultraviolet radiation and is capable of such further reaction in the presence of the phosphorescence activator in the amount …
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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
- Granted October 14, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 14, 1997.
- 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.