Patent US3820970A successfully refreshed from Google Patents.
US3820970A
Expired / Lapsed
US
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Less dusty granular gypsum product and process
Assignee: United States Gypsum Co
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Filing: 1972-12-27
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Granted: 1974-06-28
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Expires: 1992-12-27
Abstract
Abstract A compaction-granulation process of producing less dusty gypsum granules is disclosed. The process includes admixing calcium sulfate dihyrate with about 10-20 percent calcium sulfate hemihydrate and about 2-4 percent water to form a substantially dry solid-liquid mixture; compacting the mixture while at a pressure of about 1000-2000 psig into a sheet of compacted material; flaking the compacted material; and crushing the material to the desired granular size. The basic product may be used as a soil conditioner; and optional ingredients may be included to use the granular product as a fertilizer, plant nutrient supplement, pesticide, pharmaceutical and the like.
Inventors
- 👤 K Watkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:23
CPC Classifications
C; C05; C05D; C05D3/00; C01; C01F; C01F11/00; C01F11/46; C01P; C01P2004/00; C01P2004/50; C01P2006/00; C01P2006/22
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
24 words
The method of claim 1 including the step of breaking the sheet of compacted material into coarse flakes before crushing to desired granule size.
Claim 2
Dependent Claim
18 words
compacting said solid-liquid mixture while at pressures of about 1000-2000 psig into a sheet of compacted material; and
Claim 3
Dependent Claim
24 words
Forming said solid liquid mixture into a sheet of compacted material, by compaction at pressures of from about 1000 to about 2000 psig; and
Claim 4
Dependent Claim
9 words
Crushing the compacted material to the desired granule size.
Claim 5
Dependent Claim
8 words
crushing the material to the desired granule size.
Claim 6
Dependent Claim
25 words
The method of claim 1, for producing a soil conditioning material, including the step of crushing the material to approximately 6 by 16 mesh granules.
Claim 7
Dependent Claim
47 words
The method of claim 1, for producing fertilizer material, including the step of adding a material selected from the group consisting of: about 5 to 15 percent of primary plant nutrients; about 1 to 5 percent of secondary plant nutrients; and about 0.5 to 5 percent micronutrients.
Claim 8
Dependent Claim
25 words
The method of claim 1, for producing a pesticidal material, which includes the step of adding a pesticidally effective amount of a pesticidally active material.
Claim 9
Dependent Claim
24 words
The method of claim 1 including the step of adding about 0.02 - 0.05 percent by weight of a gypsum retarder to the mixture.
Claim 10
Independent Claim
82 words
The method of producing a hard, scarcely dusting, granular pesticide which includes the steps of admixing calcium sulfate dihydrate as a major ingredient with about, by weight, 10-20 percent of calcium sulfate hemihydrate, about 2-4 percent of water and a minor amount of 2-(4-chloro-6-ethylamino-2-triazin-2-ylamino)-2-methylpropionitrile to form a substantially dry, solid-liquid mixture; compacting said solid-liquid mixture while at pressures of about 1000-2000 psig into a sheet of compacted material; thereafter flaking the material; and finally crushing the material to the desired granular size.
Claim 11
Dependent Claim
57 words
A feed mixture for a hard, scarcely dusting, fertilizer sized, granular gypsum product for being compacted under pressures of about 1000-2000 psig into a sheet, and flaked and crushed into fertilizer sized granules; comprising a mixture of calcium sulfate dihydrate as a major ingredient, about 10-20 percent of calcium sulfate hemihydrate, and about 2-4 percent of water.
Claim 12
Dependent Claim
13 words
The feed mixture of claim 8 including about 0.02-0.05 percent of a retarder.
Claim 13
Dependent Claim
45 words
The feed mixture of claim 8 in which the hemihydrate is present in an amount of about 10 percent by weight; the water is present in an amount of about 2.3 percent by weight; and including about 0.01 percent by weight of citric acid retarder.
Claim 14
Dependent Claim
10 words
The feed mixture of claim 8 including a fertilizer ingredient.
Claim 15
Dependent Claim
9 words
The feed mixture of claim 8 including a pesticide.
Claim 16
Independent Claim
18 words
A method of producing a hard gypsum dihydrate granule which is resistant of dusting, comprising the steps of:
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |