US3938469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for coating particulate material with finely divided solids
Assignee: Wyeth Holdings LLC
•
Filing: 1973-09-14
•
Granted: 1976-02-17
•
Expires: 1993-09-14
Abstract
Abstract A method and apparatus is given for uniformly coating particulate fertilizer material with small amounts of finely divided micro and/or secondary nutrients by forming the particulate base fertilizer material in a falling curtain, spraying the base material with a binder solution, finally mixing in an agitated bed the base material with the finely divided nutrients, thus giving a product of micro and/or secondary nutrients uniformly distributed over the surfaces of the particulate base fertilizer.
Inventors
- 👤 Harold Henry Nau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:35
CPC Classifications
C; C05; C05B; C05B19/00; C05B19/02; C05G; C05G5/00; C05G5/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
232 words
An apparatus for uniformly coating a granular fertilizer with a small amount of a finely divided nutrient material having an average bulk density above about 1.2 g./ml. selected from the group consisting of micronutrients, secondary nutrients and mixtures thereof comprising, in combination: a. a hopper for storing granular fertilizer; b. a control gate adapted to produce a metered flow of fertilizer from said hopper in the form of a falling curtain; c. a storage vessel adapted to contain a binder solution; d. nozzles disposed so as to provide spray of said binder solution below said gate, at opposite sides of said curtain so as to produce uniformly sprayed granular fertilizer; e. conduits adapted with valve means so as to convey the binder solution at a desired pressure from said storage vessel to said nozzles; f. a mixing chamber comprising a tumbling drum adapted to blend said sprayed fertilizer with said nutrient material; g. a conveyor adapted so as to receive said sprayed granular fertilizer below said nozzles and to convey the fertilizer received into and from said tumbling drum; h. a blow case equipped with a pressurizing means adapted to receive said nutrient material; and i. a conduit adapted to inject said nutrient material into said tumbling drum under superatmospheric pressure from said blow case to form a cloud of nutrient material after said chamber is sealed with the sprayed granular fertilizer.
Claim 2
Independent Claim
232 words
An apparatus for uniformly coating a granular fertilizer with a small amount of a finely divided nutrient material having an average bulk density above about 1.2 g./ml. selected from the group consisting of micronutrients, secondary nutrients and mixtures thereof comprising, in combination: a. a hopper for storing granular fertilizer; b. a control gate adapted to produce a metered flow of fertilizer from said hopper in the form of a falling curtain; c. a storage vessel adapted to contain a binder solution; d. nozzles disposed so as to provide spray of said binder solution below said gate, at opposite sides of said curtain so as to produce uniformly sprayed granular fertilizer; e. conduits adapted with valve means so as to convey the binder solution at a desired pressure from said storage vessel to said nozzles; f. a mixing chamber comprising a tumbling drum adapted to blend said sprayed fertilizer with said nutrient material; g. a conveyor adapted so as to receive said sprayed granular fertilizer below said nozzles and to convey the fertilizer received into and from said tumbling drum; h. a blow case equipped with a pressurizing means adapted to receive said nutrient material; and i. a conduit adapted to inject said nutrient material into said tumbling drum under superatmospheric pressure from said blow case to form a cloud of nutrient material after said chamber is sealed with the sprayed granular fertilizer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-16 | 1979-08-18 | 1980-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-16 | 1983-08-18 | 1984-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-16 | 1987-08-18 | 1988-02-17 | $7700.00 | Window Closed / Lapsed |