US2537904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of washing acidified finely divided solids
Assignee: CENTRAL SILICA Co
•
Filing: 1946-12-13
•
Granted: 1951-01-09
•
Expires: 1966-12-13
Abstract
No abstract record available.
Inventors
- 👤 Jr Robert W Mcallister
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:49
CPC Classifications
C; C03; C03B; C03B1/00; C04; C04B; C04B33/00; C04B33/02; C04B33/04; C04B33/06; C04B33/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2382317A
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US654647A
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US1474893A
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US1544894A
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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) | 1954-01-08 | 1954-07-10 | 1955-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-08 | 1958-07-10 | 1959-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-08 | 1962-07-10 | 1963-01-09 | $7700.00 | Window Closed / Lapsed |