Patent US3925053A successfully refreshed from Google Patents.
US3925053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slow acting fertilizer
Assignee: Swift Chemical Co
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Filing: 1973-05-14
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Granted: 1975-12-09
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Expires: 1993-05-14
Abstract
Abstract Fertilizer compositions which are slowly and uniformly leached and made available to the plant over a relatively long period of time resulting in more efficient utilization of the fertilizer by the plant are provided by bonding fertilizer material with the hemihydrate of calcium sulfate.
Inventors
- 👤 Joseph P Kealy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:10
CPC Classifications
C; C05; C05G; C05G5/00; C05G5/30; C05G5/35
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
78 words
A HIGHLY INSOLUBLE GRANULAR FERTILIZER THAT WILL SIMULTANEOUSLY RELEASE ALL PLANT FOOD SOURCES SLOWLY AND UNIFORMLY OVER A LONG PERIOD OF TIME, WHICH FERTILIZER CONTAINS ABOUT TEN PERCENT TO ABOUT 50 PERCENT, BY WEIGHT, OF HYDRATED CALCIUM SULFATE AND ABOUT 90 PERCENT TO ABOUT 50 PERCENT OF ISOBUTYLIDENE DIUREA, SAID CALCIUM SULFATE BEING HYDRATED AND CRYSTALLIZED WHILE IN INTIMATE CONTACT WITH THE SAID ISOBUTYLIDENE DIUREA SO AS TO PRODUCE A HOMOGENEOUSLY BOUND FERTILIZER HAVING CONTROLLED RATES OF SOLUBILITY.
Claim 2
Dependent Claim
78 words
A HIGHLY INSOLUBLE GRANULAR FERTILIZER THAT WILL SIMULTANEOUSLY RELEASE ALL PLANT FOOD SOURCES SLOWLY AND UNIFORMLY OVER A LONG PERIOD OF TIME, WHICH FERTILIZER CONTAINS ABOUT TEN PERCENT TO ABOUT 50 PERCENT, BY WEIGHT, OF HYDRATED CALCIUM SULFATE AND ABOUT 90 PERCENT TO ABOUT 50 PERCENT OF ISOBUTYLIDENE DIUREA, SAID CALCIUM SULFATE BEING HYDRATED AND CRYSTALLIZED WHILE IN INTIMATE CONTACT WITH THE SAID ISOBUTYLIDENE DIUREA SO AS TO PRODUCE A HOMOGENEOUSLY BOUND FERTILIZER HAVING CONTROLLED RATES OF SOLUBILITY.
Claim 3
Dependent Claim
17 words
The fertilizer of claim 1 wherein the granules contain homogeneously bound highly insoluble phosphorus and potassium sources.
Claim 4
Dependent Claim
18 words
The fertilizer of claim 1 wherein the phosphorus and potassium sources are vitreous masses of K2O and P2O5.
Claim 5
Dependent Claim
18 words
The fertilizer of claim 1 wherein the granules are pellets of about 5 mm. to about 25 mm.
Claim 6
Dependent Claim
17 words
The fertilizer of claim 4 wherein the granules contain homogeneously bound highly insoluble phosphorus and potassium sources.
Claim 7
Dependent Claim
18 words
The fertilizer of claim 4 wherein the phosphorus and potassium sources are vitreous masses of K2O and P2O5.
References Cited (Backward Citations)
US3070435A
Cited
US2988439A
Cited
US2955673A
Cited
US3024098A
Cited
US3050385A
Cited
US3322528A
Cited
US3149934A
Cited
US3326665A
Cited
US3280536A
Cited
US3419379A
Cited
US3399510A
Cited
US3660068A
Cited
US3659399A
Cited
US3762909A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |