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Color Photography Patents — KeUey 157
Leonard T. Troland, U. S. No. 1,535,700. Apr. 28, 1925. Filed
Sept. 13, 1922
Page 1, lines 9 to 20: This invention relates to the selective treatment of the exposed and unexposed portions of light sensitive films by which one of the portions, for example the exposed portion, is made harder than the other portion, whereby the two portions react differently to subsequent treatment, as for example a hot water etch in which the relative soft portion is dissolved off leaving the other portion in relief, or a dye bath in which the dye is absorbed predominantly by one portion.
Claim 18: The art of treating light sensitive film having exposed and relatively unexposed portions which comprises mixing with pyrogallic acid, sodium hydroxide, and ammonium chloride, thereby to form sodium chloride and ammonium hydroxide, and hardening said exposed portions with the mixture. Frederick E. Ives, U. S. No. 980,962. Jan. 10, 1911. Filed April
28, 1910
Page 1, lines 75 to 80: I sometimes incorporate a non-actinic dye with the sensitizing solution, to limit the penetration of light, this dye being preferably acid, so that it may be discharged by an alkaline developer.
Claim 2 : The within described improvement in the process of making colored photographic prints in graduated relief, the same consisting in incorporating a non-actinic coloring medium in the sensitized colloid coating, exposing said sensitized coating to light, developing the print, discharging the coloring medium, treating the developed relief print with a hardening and mordanting agent such as chromic acid, and then dyeing the print. Jens Herman Christen sen, U. S. No. 1,517,049. Nov. 25, 1924.
Filed Sept. 6, 1919
Claim 3: A sensitized photographic element comprising a film containing a silver halide and a substantial amount of dye which will be bleached catalytically by reducing agents on places on the said film which after developing will contain silver. Gustav Kogel and H. Neuenhaus, U. S. No. 1,444,469. Feb. 6,
1923. Filed Sept. 12, 1922
Claim 1 : Process for producing layers sensitive to light on a suitable base, consisting in covering the base with diazoanhydrides, bleached on exposure to light. P. Fischer, U. S. No. 1,055,155. Mar. 4, 1913. Filed July 1, 1912