US2798609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of concentrating sludge
Assignee: Equipment Dev Co Inc
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Filing: 1955-03-31
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Granted: 1957-07-09
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Expires: 1975-03-31
Abstract
No abstract record available.
Inventors
- 👤 Edmund G Smith
- 👤 Otell M Cocchiarella
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:33
CPC Classifications
B; B01; B01D; B01D37/00; B01D37/02; B01D33/00; B01D33/06; B01D33/067; B01D33/11; B01D33/35; B01D33/37; B01D33/39; B01D33/44; B01D33/48; B01D33/50; B01D33/70; B01D33/72
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-08 | 1961-01-07 | 1961-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-08 | 1965-01-07 | 1965-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-08 | 1969-01-07 | 1969-07-09 | $7700.00 | Window Closed / Lapsed |