Solid colored composition mutable by ultraviolet radiation
CA 2120838 A1 · Owner: Mcginniss, Vincent Daniel · Inventors: Mcginniss, Vincent Daniel; Whitmore, Robert Samuel, Jr; Macdonald, John Gavin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A solid colored composition which includes a colorant and an ultraviolet radiation transorber. The colorant, in the presence of the ultraviolet radiationtransorber is adapted, upon exposure of the transorber to ultraviolet radiation to be mutable. The ultraviolet radiation transorber is adapted to absorb ultraviolet radiation and interact with the colorant to effect the irreversible mutation of the colorant. By way of example the solid colored composition, can be a toner adapted to be utilized in an electrophotographic process. The toner includes the colorant and ultraviolet radiation transorber as just described, and a carrier. The carrier can be a polymer and the toner may, contain a …
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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 April 8, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 8, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 8, 2016.
- 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.