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Patent US2439432A successfully refreshed from Google Patents.
US2439432A
Expired / Lapsed
US
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Ammoniation of fertilizers
Assignee: EIDP Inc
•
Filing: 1943-09-27
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Granted: 1948-04-13
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Expires: 1963-09-27
Abstract
No abstract record available.
Inventors
- 👤 Frank G Keenen
- 👤 Ralph L Dodge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:59
CPC Classifications
C; C05; C05B; C05B1/00; C05B1/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1275276A
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US1546562A
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US1949129A
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GB357461A
Cited
US2048658A
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US2102830A
Cited
US2279200A
Cited
US2348343A
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US2415464A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-04-13 | 1951-10-13 | 1952-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-13 | 1955-10-13 | 1956-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-13 | 1959-10-13 | 1960-04-13 | $7700.00 | Window Closed / Lapsed |