Patent US3660068A successfully refreshed from Google Patents.
US3660068A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Soil additives
Assignee: Phillips Petroleum Co
•
Filing: 1969-12-29
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Granted: 1972-05-02
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Expires: 1989-12-29
Abstract
Abstract A method of preparing a granulated soil additive of calcium sulfate and a soluble salt, preferably a fertilizer, which involves granulating the calcium sulfate employing the soluble salt, incorporated with the calcium sulfate in solution form, as the granulating agent.
Inventors
- 👤 Joseph F Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:20
CPC Classifications
C; C05; C05B; C05B7/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
27 words
The method of claim 1 in which said salt is selected from the group consisting of ammonium nitrate, ammonium phosphate, diammonium phosphate, urea, potash and mixtures thereof.
Claim 2
Dependent Claim
21 words
The method of claim 1 in which said gypsum comprises unwashed gypsum containing phosphoric acid and said salt is diammonium phosphate.
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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) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |