Chemistry: fertilizers – Processes and products – Organic material-containing
Reexamination Certificate
2009-02-17
2011-11-01
Lorengo, Jerry A (Department: 1731)
Chemistry: fertilizers
Processes and products
Organic material-containing
C071S001000, C071S027000, C071S064100, C071S902000, C564S012000
Reexamination Certificate
active
08048189
ABSTRACT:
Reduced volatility of urea fertilizers are prepared in accordance with the present invention by first preparing an N-(n-butyl)-thiophosphoric triamide (NBPT) solution by dissolving NBPT in a mixture of an amino alcohol having the formula 1—(H)x—N—((CH2)m—OH)nwhere m is 1-3, x is 0 or 1, and n is 2 when x is 1 and 3 when x is 0: or the formula 2—(H)y—N—((CH2)—CHOH—CH3)zsuch that the length of the carbon chain where the secondary hydroxyl group is located is 3, y is 0 or 1, and z is 2 when y is 1 and 3 when y is 0, and a carboxylic acid having 6 or fewer carbon atoms. The solution is then combining with a urea fertilizer in granular or liquid form.
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Whitehurst Brooks M.
Whitehurst Garnett B.
,MacCord Mason PLLC
Lorengo Jerry A
Smith Jennifer
Whitehurst Associates Inc.
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