Patent US1660442A successfully refreshed from Google Patents.
Patent US2504545A successfully refreshed from Google Patents.
US2504545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Granulated fertilizer
Assignee: Davison Chemical Corp
•
Filing: 1947-01-28
•
Granted: 1950-04-18
•
Expires: 1967-01-28
Abstract
No abstract record available.
Inventors
- 👤 Waring Charles Edward
- 👤 Jr Casimer C Legal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:06
CPC Classifications
C; C05; C05B; C05B1/00; C05B1/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
A METHOD OF MANUFACTURING A MIXED PHOSPHATIC FERTILIZER HAVING A LOW FLUORINE CONTENT AND IN A CONDITION SUITABLE FOR BAGGING AND USE, COMPRISING MIXING FINELY DIVIDED PHOSPHATE ROCK WITH SULFURIC ACID HAVING A CONCENTRATION OF AT LEAST 93% H2SO4, SAID PHOSPHATE ROCK AND SULFURIC ACID BEING MIXED IN SUCH PROPORTIONS THAT AT LEAST SUFFICIENT SULFURIC ACID IS PRESENT TO REACT WITH THE ACID REACTIBLE CONSTITUENTS IN THE ROCK AND FORM PHOSPHORIC ACID FROM THE CALCIUM PHOSPHATE
Claim 2
Independent Claim
76 words
A METHOD OF MANUFACTURING A MIXED PHOSPHATIC FERTILIZER HAVING A LOW FLUORINE CONTENT AND IN A CONDITION SUITABLE FOR BAGGING AND USE, COMPRISING MIXING FINELY DIVIDED PHOSPHATE ROCK WITH SULFURIC ACID HAVING A CONCENTRATION OF AT LEAST 93% H2SO4, SAID PHOSPHATE ROCK AND SULFURIC ACID BEING MIXED IN SUCH PROPORTIONS THAT AT LEAST SUFFICIENT SULFURIC ACID IS PRESENT TO REACT WITH THE ACID REACTIBLE CONSTITUENTS IN THE ROCK AND FORM PHOSPHORIC ACID FROM THE CALCIUM PHOSPHATE
References Cited (Backward Citations)
US1637428A
Cited
GB300965A
Cited
US1712404A
Cited
US1849987A
Cited
US1916114A
Cited
US1851179A
Cited
US2060310A
Cited
US2173826A
Cited
US2338407A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-04-17 | 1953-10-17 | 1954-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-17 | 1957-10-17 | 1958-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-17 | 1961-10-17 | 1962-04-18 | $7700.00 | Window Closed / Lapsed |