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US 4,556,562 AGranted
Stable anti-pest neem seed extract
AssigneeVikwood, Ltd.
InventorRobert O. Larson
Life of this patent
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Abstract
Storage stable composition effective as a biorational agent for protection against pests, e.g. Japanese beetles, is a diluted ethanol neem seed extract comprising from about 2,000 to about 4,000 ppm azadirachtin and having a pH ranging from about 3.5 to about 6.0.
Claims18
A process for preparing a storage stable neem seed extract, said process comprising the steps of:
- (a) forming neem seed particles ranging in size from about 350 microns to about 2 millimeters (maximum dimension);
- (b) extracting the paticles with extracting agent comprising ethanol at a temperature ranging from about 60.degree. C. to about 90.degree. C. and separating the extract to obtain a solution comprising from about 5,000 to about 10,000 ppm azadirachtin;
- (c) diluting to form an aqueous emulsion comprising from about 2,000 to about 4,000 ppm azadirachtin;
- (d) measuring the pH, and if it is outside the range of from about 3.5 to about 6.0, adjusting the pH to range from about 3.5 to about 6.0.
1 more element
A storage stable aqueous azadirachtin-containing composition, said composition comprising from about 2,000 to about 4,000 ppm azadirachtin, said composition having a pH ranging from about 3.5 to about 6.0.
Dependencies are inferred from the claim text.