US4019890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing coated fertilizer
Assignee: Chisso Asahi Fertilizer Co Ltd
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Filing: 1974-12-03
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Granted: 1977-04-26
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Expires: 1994-12-03
Abstract
Abstract Granular slow-releasing fertilizers completely coated with water-resisting resin are produced in such a manner that the coated granules do not stick together, through one step operation by spraying a solution of the resin which has the property capable of maintaining the solution state while it is hot but turning into jelly-like gel when it is cooled, on granules of fertilizer and drying the said granules with a high speed drying hot air on the spot upon being sprayed with the solution of the resin.
Inventors
- 👤 Toshio Fujita
- 👤 Chigo Takahashi
- 👤 Masanari Ohshima
- 👤 Tsunezo Ushioda
- 👤 Hirozo Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:32
CPC Classifications
B; B01; B01J; B01J2/00; B01J2/006; C; C05; C05G; C05G3/00; C05G3/30; C05G5/00; C05G5/30; C05G5/38
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
129 words
A method for producing slow-releasing granular fertilizer fully coated with water-resisting, transparent, lustrous layer of resin in such a manner that the coated granules do not stick together, which comprises spraying a solution having a viscosity of 40 C.P. or less at close to its boiling point of a thermoplastic resin in a hydrocarbon or chlorinated hydrocarbon solvent, upon fertilizer granules, and drying said fertilizer granules upon being sprayed with said solution, continuously and immediately on the spout with hot, dry air at an air speed of at least 15m/sec., said solution having the property capable of forming a solution while it is hot but turning into jelly-like gel when it is cooled and said granules being at a temperature of 40°-90° C during the drying and spraying steps.
Claim 2
Independent Claim
129 words
A method for producing slow-releasing granular fertilizer fully coated with water-resisting, transparent, lustrous layer of resin in such a manner that the coated granules do not stick together, which comprises spraying a solution having a viscosity of 40 C.P. or less at close to its boiling point of a thermoplastic resin in a hydrocarbon or chlorinated hydrocarbon solvent, upon fertilizer granules, and drying said fertilizer granules upon being sprayed with said solution, continuously and immediately on the spout with hot, dry air at an air speed of at least 15m/sec., said solution having the property capable of forming a solution while it is hot but turning into jelly-like gel when it is cooled and said granules being at a temperature of 40°-90° C during the drying and spraying steps.
Claim 3
Dependent Claim
39 words
A method according to claim 1 wherein said thermoplastic resin is at least one kind selected from the group consisting of polyolefins, copolymers of ethylene with vinyl acetate whose content is 5% by weight or less and polyvinylidene chloride.
Claim 4
Dependent Claim
13 words
A method according to claim 1 wherein said thermoplastic resin is a polyolefin.
Claim 5
Dependent Claim
14 words
A method according to claim 1 wherein said thermoplastic resin is low density polyethylene.
Claim 6
Dependent Claim
13 words
A method according to claim 1 wherein said thermoplastic resin is amorphous polypropylene.
Claim 7
Dependent Claim
19 words
A method according to claim 1 wherein said solvent has a boiling point in the range of 80°-150° C.
Claim 8
Dependent Claim
15 words
A method according to claim 1 wherein said solvent is toluene, xylene, trichloroethylene or tetrachloroethylene.
Claim 9
Dependent Claim
11 words
A method according to claim 1 wherein said solvent is tetrachloroethylene.
Claim 10
Dependent Claim
23 words
A method according to claim 1 wherein the velocity of said high speed drying hot air is 15 to 40 m/sec or greater.
Claim 11
Independent Claim
132 words
A method for producing slow-releasing granular fertilizer fully coated with water-resisting transparent, lustrous layer of resin in such a manner that the coated granules do not stick together, which comprises spraying a solution having a viscosity of 40 C.P. or lower at close to its boiling point of a thermoplastic resin and an additive thereto, in a hydrocarbon or chlorinated hydrocarbon solvent, upon fertilizer granules, and drying said fertilizer granules upon being sprayed with said solution, continuously and immediately on the spot with hot, dry air at an air speed of at least 15m/sec., said solution having the property capable of forming a solution while it is hot but turning into jelly-like gel when it is cooled, said granules being at a temperature of 40°-90° C during the drying and spraying steps.
Claim 12
Independent Claim
132 words
A method for producing slow-releasing granular fertilizer fully coated with water-resisting transparent, lustrous layer of resin in such a manner that the coated granules do not stick together, which comprises spraying a solution having a viscosity of 40 C.P. or lower at close to its boiling point of a thermoplastic resin and an additive thereto, in a hydrocarbon or chlorinated hydrocarbon solvent, upon fertilizer granules, and drying said fertilizer granules upon being sprayed with said solution, continuously and immediately on the spot with hot, dry air at an air speed of at least 15m/sec., said solution having the property capable of forming a solution while it is hot but turning into jelly-like gel when it is cooled, said granules being at a temperature of 40°-90° C during the drying and spraying steps.
Claim 13
Dependent Claim
15 words
A method according to claim 10 wherein said additive is a surfactant having oleophilic property.
Claim 14
Dependent Claim
40 words
A method according to claim 10 wherein said additive is at least one kind selected from the group consisting of waxes and thermoplastic resins other than said thermoplastic resin and having a higher moisture-permeability than that of said thermoplastic resin.
Claim 15
Dependent Claim
12 words
A method according to claim 10 wherein said additive is paraffin wax.
Claim 16
Dependent Claim
12 words
A method according to claim 10 wherein said additive is hardened oil.
Claim 17
Dependent Claim
11 words
A method according to claim 10 wherein said additive is polystyrene.
References Cited (Backward Citations)
US3276857A
Cited
US3388990A
Cited
US3372019A
Cited
US3259482A
Cited
US3734707A
Cited
US3873734A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-25 | 1980-10-25 | 1981-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-25 | 1984-10-25 | 1985-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-25 | 1988-10-25 | 1989-04-26 | $7700.00 | Window Closed / Lapsed |