US2600458A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Upflow pressure diatomite filtering apparatus
Assignee: Individual
•
Filing: 1950-03-25
•
Granted: 1952-06-17
•
Expires: 1970-03-25
Abstract
No abstract record available.
Inventors
- 👤 Harry A Ackley
- 👤 Ralph N Perkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:44
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/114; B01D29/50; B01D29/52; B01D29/62; B01D29/66; B01D35/00; B01D35/14; B01D35/153; B01D37/00; B01D37/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US272831A
Cited
US870631A
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US1866970A
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US1771928A
Cited
US1992101A
Cited
US2347927A
Cited
US2423172A
Cited
US2496370A
Cited
US2562699A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-06-17 | 1955-12-17 | 1956-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-06-17 | 1959-12-17 | 1960-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-06-17 | 1963-12-17 | 1964-06-17 | $7700.00 | Window Closed / Lapsed |