Patent US3137565A successfully refreshed from Google Patents.
US3137565A
Expired / Lapsed
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Method of producing a non-caking fertilizer and the product thereof
Assignee: WR Grace and Co
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Filing: 1957-01-28
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Granted: 1964-06-16
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Expires: 1977-01-28
Abstract
No abstract record available.
Inventors
- 👤 John C Hayes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:44
CPC Classifications
C; C05; C05B; C05B1/00; C05B1/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
A METHOD OF PRODUCING A NON-CAKING, FREE-FLOWING GRANULAR COMMERICAL FERTILIZER PRODUCT WHICH COMPRISES MIXING A GRANULAR FERTILIZER COMPOSITION WITH A SMALL AMOUNT OF DRY, FINELY-DIVIDED PARTICLES OF ACID-TREATED VERMICULITE, SAID ACID-TREATED VERMICULITE BEING PEPARED BY CONTACTING THE VERMICULITE WITH A STRONG MINERAL ACID OTHER THAN HYDROFLUORIC ACID, WSHING THE VERICULITE UNTIL IT IS SUBSTANTIALLY ACID-FREE AND THEREAFTER DRYING THE RESULTANT ACID-FREE VERMICULITE.
Claim 2
Independent Claim
62 words
A METHOD OF PRODUCING A NON-CAKING, FREE-FLOWING GRANULAR COMMERICAL FERTILIZER PRODUCT WHICH COMPRISES MIXING A GRANULAR FERTILIZER COMPOSITION WITH A SMALL AMOUNT OF DRY, FINELY-DIVIDED PARTICLES OF ACID-TREATED VERMICULITE, SAID ACID-TREATED VERMICULITE BEING PEPARED BY CONTACTING THE VERMICULITE WITH A STRONG MINERAL ACID OTHER THAN HYDROFLUORIC ACID, WSHING THE VERICULITE UNTIL IT IS SUBSTANTIALLY ACID-FREE AND THEREAFTER DRYING THE RESULTANT ACID-FREE VERMICULITE.
References Cited (Backward Citations)
US2008469A
Cited
US2341800A
Cited
US2498480A
Cited
US2702747A
Cited
US2779670A
Cited
US2669510A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-16 | 1967-12-16 | 1968-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-16 | 1971-12-16 | 1972-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-16 | 1975-12-16 | 1976-06-16 | $7700.00 | Window Closed / Lapsed |