The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 22, 1995
Filed:
Nov. 07, 1994
Roger A Mader, Stillwater, MN (US);
Robert J Ryther, St. Paul, MN (US);
Minnesota Mining and Manufacturing Company, St. Paul, MN (US);
Abstract
Metal oxidizing agents (such as silver oxide or silver nitrate) are added to a solution of organic chemicals which comprise an unwanted level of organic reducing agents (either aqueous or organic solutions in which the metal oxidizing agent does not dissolve) and the metal oxidizing agent oxidizes at least some portion of said organic reducing agents. Because the metal oxidizing agent is insoluble in the solution, it is readily removed (e.g., by filtration or sedimentary techniques) to leave a solution with reduced amounts of reducing agents therein. This process is particularly useful for purifying phthalazine, behenic acid, and other toners, the component forming the counterion with silver ion in forming the light-insensitive silver source material and any other additives and raw materials which can be dissolved in a solvent medium in which the metal oxidizing agent is not highly soluble.