UNITED STATES PATENT OFFICE 2,249,023 METHOD of PRE PARING COLLODAL, SL VER, ODOE COMPOSITION and the PRODUCT Michael G
Patented July 15, 1941 2,249,023 UNITED STATES PATENT OFFICE 2,249,023 METHOD OF PRE PARING COLLODAL, SL VER, ODOE COMPOSITION AND THE PRODUCT Michael G. Miinaeff, Metuchen, John P. Greze, Plainfield, and Rudolf J. Priepke, New Bruns wick, N. J., assignors, by mesne assignments, to A. C. Barnes Company, Inc., New Brunswick, N. J., a corporation of Delaware No Drawing. Application December 10, 1938, Seria No. 244,920 Claims. (C. 252-313) This invention relates to improvements in United States Patent No. 1,610,391, issued colloidal silver iodide compounds and/or prepa December 14, 1926. rations such as are used in medicine as imidiy No. 3. Silver iodide compound prepared by us antiseptic or bacteriostatic agents. Such prep from “Silvol’ by the method described in the arations Commonly contain about 20% of silver 5 United States Patent No. 1,610,391, issued iodide which is present in colloidal form. December 14, 1926. There are several such preparations in actual No. 4. Silver iodide compound prepared by us use at the present tirne. It is generally advised in accordance With United States Patent No. that such preparations in solution be freshly 1,783,334, issued December 2, 1930. prepared for use and that they should not be O No. 5. Silver iodide compounds prepared by employed after standing for several days or more us by the Well known method of direct inter than one week. change of ions between Soluble Silver salts and We ilave found that colloida Silver iodide Soluble iodides, such as Silver nitrate on the one compounds made by the ordinary well known hand and Sodium iodide or potassium iodide on methods are lacking in chemical stability and the other, in the presence of protective colloids, also that such solutions are subject to mold such as powdered egg albumen, gelatin, gum growth.
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