Uniform, efficient distribution of hydrophobic materials through hydrophilic colloid layers, and products useful therefor
CA 1079432 A · Owner: Eastman Kodak Company · Inventors: Chen, Tsang J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved process is disclosed for uniformly dispersing hydrophobic materials through a hydrophilic colloid layer such as, for example, a photographically useful layer containing gelatin. The process over which the present invention is a valuable improvement comprises the steps: (a) forming an aqueous dispersion by intermixing the hydrophobic material and an aqueous polymeric latex, optionally including gelatin in the dispersion; (b) forming a wet layer by coating onto a suitable support the aqueous dispersion from step (a); and (c) thereafter removing a substantial proportion of the water from the wet layer through which the hydrophobic material is dispersed. The present process relates …
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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 June 10, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 10, 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
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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.