Patent US3630713A successfully refreshed from Google Patents.
US3630713A
Expired / Lapsed
US
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Method of producing fertilizer granules
Assignee: Western AG Minerals Co
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Filing: 1968-07-22
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Granted: 1971-12-28
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Expires: 1988-07-22
Abstract
Abstract A method of producing competent granules of a potassium salt fertilizer which includes the steps of grinding and granulating the material with an easily dehydrated magnesium salt and Portland cement allowing time for hydration of the granules, filling the voids of the granules with an inorganic salt solution and lightly coating the granules with a coating liquid and wherein the method may be conducted without either or both of the last two steps and may be conducted without the addition of the magnesium salt and Portland cement and the hydration step.
Inventors
- 👤 Ben E Adams
- 👤 William H Lawhon
- 👤 Billy C Phillips
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:32
CPC Classifications
C; C05; C05D; C05D1/00; C05D1/005
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
25 words
The method according to claim 1 wherein the amount of portland cement used is approximately 1 percent by weight of the ground and mixed materials.
Claim 2
Dependent Claim
20 words
The method according to claim 1 wherein the easily dehydrated magnesium salt in the mixing and grinding step is leonite.
Claim 3
Dependent Claim
32 words
The method according to claim 3 wherein the amount of leonite used in the mixing and grinding step is between 8 and 10 percent by weight of the ground and mixed materials.
Claim 4
Dependent Claim
20 words
The method according to claim 1 wherein the easily dehydrated magnesium salt in the mixing and grinding step is MgSO4.7H2O.
Claim 5
Dependent Claim
32 words
The method according to claim 5 wherein the amount of MgSO4.7H2O used in the mixing and grinding step is between 6 and 7.3 percent by weight of the ground and mixed materials.
Claim 6
Dependent Claim
24 words
The method according to claim 1 wherein said mixing and grinding step produces a mixed material having a broad linear range of particle size.
Claim 7
Dependent Claim
26 words
The method according to claim 1 wherein said coating oil is selected from a group consisting of a vegetable oil and a high wax petroleum oil.
Claim 8
Dependent Claim
20 words
The method according to claim 1 wherein approximately one-half of 1 percent by weight of said coating oil is used.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |