Patent US3313613A successfully refreshed from Google Patents.
US3313613A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulfur-coated urea fertilizer and method of making
Assignee: Mississippi Chemical Corp
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Filing: 1964-02-27
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Granted: 1967-04-11
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Expires: 1984-02-27
Abstract
No abstract record available.
Inventors
- 👤 Albert W Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:21
CPC Classifications
C; C05; C05C; C05C9/00; C05C9/005
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
64 words
A METHOD FOR COMBINING ELEMENTAL SULPHUR WITH UREA TO PRODUCE A UNIFORM UREA-SULFUR PHYSICAL MISTURE WHICH COMPRISES THE STEP OF ADMIXING A MINOR PROPORTION OF SOLID ELEMENTAL SULFUR PARTICLES, MOISTENED WITH A MINOR PROPORTION WITH RESPECT TO THE SULFUR OF AQUEOUS FORMALDEHYDE, WITH A MAJOR PROPORTION OF SOLID UREA PARTICLES, TO FORM A UNIFORM STABLE BLEND OF SULFUR PARTICLES ADHERING TO THE UREA PARTICLES.
Claim 2
Independent Claim
64 words
A METHOD FOR COMBINING ELEMENTAL SULPHUR WITH UREA TO PRODUCE A UNIFORM UREA-SULFUR PHYSICAL MISTURE WHICH COMPRISES THE STEP OF ADMIXING A MINOR PROPORTION OF SOLID ELEMENTAL SULFUR PARTICLES, MOISTENED WITH A MINOR PROPORTION WITH RESPECT TO THE SULFUR OF AQUEOUS FORMALDEHYDE, WITH A MAJOR PROPORTION OF SOLID UREA PARTICLES, TO FORM A UNIFORM STABLE BLEND OF SULFUR PARTICLES ADHERING TO THE UREA PARTICLES.
Claim 3
Dependent Claim
53 words
SOLID UREA PARTICLES HAVING UNIFORMLY DISTRIBUTED ON THE SURFACE THEREOF A MINOR PORPORTION OF SUBSTANTIALLY SMALLER PARTICLES OF SOLID ELEMENTAL SULFUR PARTICLES BONDED TO THE UREA BY A UREA-FORMALDEHYDE COMPOSITION, PRESENT AT THE INTERFACE BETWEEN THE UREA AND SULFUR PARTICLES IN A MINOR PORPORTION WITH RESPECT TO BOTH THE UREA AND THE SULFUR.
Claim 4
Dependent Claim
53 words
SOLID UREA PARTICLES HAVING UNIFORMLY DISTRIBUTED ON THE SURFACE THEREOF A MINOR PORPORTION OF SUBSTANTIALLY SMALLER PARTICLES OF SOLID ELEMENTAL SULFUR PARTICLES BONDED TO THE UREA BY A UREA-FORMALDEHYDE COMPOSITION, PRESENT AT THE INTERFACE BETWEEN THE UREA AND SULFUR PARTICLES IN A MINOR PORPORTION WITH RESPECT TO BOTH THE UREA AND THE SULFUR.
References Cited (Backward Citations)
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US2618546A
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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) | 1970-04-10 | 1970-10-10 | 1971-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-10 | 1974-10-10 | 1975-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-10 | 1978-10-10 | 1979-04-11 | $7700.00 | Window Closed / Lapsed |