Chemistry: fertilizers – Processes and products – Organic material-containing
Reexamination Certificate
2008-07-22
2008-07-22
Sayala, C. (Department: 1794)
Chemistry: fertilizers
Processes and products
Organic material-containing
C071S029000, C071S030000, C071S031000, C071S032000, C071S064020, C071S064110, C071S064130
Reexamination Certificate
active
07402190
ABSTRACT:
The present invention relates to a method for making formulated nitrogenous and complex fertilizers, in granule form, suitable for slowly releasing nitrogen, comprising the steps of preparing an aqueous urea/formaldehyde dispersion with a molar ratio from 0.8:1 to 2:1, adding an aqueous catalyzer solution in a weight ratio from 0.1 to 4%, controlling the pH of the aqueous dispersion to hold it within a range from 4.0 to 7.0, and supplying the aqueous dispersion to a recirculating granulating device, as a growth seed.
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Costa Giancarlo
Rizzi Giuseppe
Costigan James V.
Hedman & Costigan ,P.C.
Sayala C.
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