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23. For an Improvement in Coloring Daguerreotype Plates
1846, January (patent), 1847, February (published)
"23. For an Improvement in Coloring Daguerreotype Plates", American Patents, Journal of the Franklin Institute of the State of Pennsylvania, and American Repository, February, 1847, p.105-106. Patent was issued in January, 1846.
23. For an Improvement in Coloring Daguerreotype Plates; John B. Isenring, of Switzerland, assigned to Frederick Langenheim, Philadelphia, Pennsylvania, January 30.
The patentee says, "The nature of my invention consists in coloring a daguerreotype picture by agitating a quantity of highly pulverized mineral, or other suitable color in a box, and then placing in said box the plate to be colored, having only such parts exposed as are to receive the color, the rest being covered by a stencil or other similar device, where it remains until the color settles upon it in sufficient quantities."
Claim. "What I claim as my invention and desire to secure by letters patent, is the process of depositing the color thereon, substantially as herein described, by causing the finely pulverized particles of color to float in the air over where the plate is placed, which, as they settle, are deposited on the uncovered portions of the plate, in the manner and for the purpose herein described.
"I also claim, in combination therewith, covering the picture with a stencil, as set forth, constructed in the manner and for the purpose described."