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:
Feb. 08, 2005
Filed:
Jun. 21, 2001
George M. Murray, Columbia, MD (US);
Craig A. Kelly, Ellicott City, MD (US);
O. Manuel UY, Ellicott City, MD (US);
Lawrence W. Hunter, Ellicott City, MD (US);
David S. Lawrence, Ellicott City, MD (US);
George M. Murray, Columbia, MD (US);
Craig A. Kelly, Ellicott City, MD (US);
O. Manuel Uy, Ellicott City, MD (US);
Lawrence W. Hunter, Ellicott City, MD (US);
David S. Lawrence, Ellicott City, MD (US);
The Johns Hopkins University, Baltimore, MD (US);
Abstract
A method of inhibiting or preventing the use of anhydrous ammonia as a solvent in a dissolving metal reduction process comprises adding to anhydrous ammonia a chemical reagent which is capable of scavenging solvated electrons generated when alkali or alkaline earth metal is dissolved in the anhydrous ammonia, the chemical reagent being added to the anhydrous ammonia such that when alkali metal is dissolved in the anhydrous ammonia containing the chemical reagent and thereafter ephedrine, pseudoephedrine or combination thereof is introduced to the anhydrous ammonia to produce a reaction product, the methamphetamine yield in the reaction product is below 50%, preferably below 10%, and more preferably below 1%. Preferred chemical reagents include Fe(III)citrate, ferrocene, 2-chloro-6-(trichloromethyl)pyridine and 1,1,1,2-tetrafluoroethane.