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US2670849A
Expired / Lapsed
US
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Apparatus for filtering materials
Assignee: Individual
•
Filing: 1952-05-01
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Granted: 1954-03-02
•
Expires: 1972-05-01
Abstract
No abstract record available.
Inventors
- 👤 Russell P Dunmire
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:31
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/24; B01D46/26; B01D21/00; B01D21/0012; B01D21/26; B01D21/262; B01D33/00; B01D33/06; B01D33/073
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US978450A
Cited
GB191202420A
Cited
US1262146A
Cited
US2144418A
Cited
US2338779A
Cited
US2442234A
Cited
US2596384A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-01 | 1957-08-31 | 1958-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-01 | 1961-08-31 | 1962-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-01 | 1965-08-31 | 1966-03-02 | $7700.00 | Window Closed / Lapsed |