US3587975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aerating rotary filter sweep
Assignee: Individual
•
Filing: 1970-06-22
•
Granted: 1971-06-28
•
Expires: 1990-06-22
Abstract
Abstract A ROTARY SWEEP, USED IN BACKWASHING OF PARTICULATE FILTER BEDS, PREFERABLY OF THE REACTIVELY DRIVEN TYPE, IS PROVIDED WITH APPARATUS TO CAUSE IT TO DISCHARGE JETS OF AERATED WATER. SUCH AERATED WATER ENHANCES THE SCRUBBING ACTION AND, WHEN THE SWEEP IS REACTIVELY DRIVEN, INCREASES THE REACTIVE FORCES. MEANS FOR AERATING THE WATER COMPRISES A PLURALITY OF EDUCTORS MOUNTED ON EACH OF THE RADIALLY EXTENDING SWEEP ARMS. THESE ARE PROVIDED WITH ATMOSPHERIC AIR DESPITE THE FACT THAT, DURING THE BACKWASH OPERATION, THEY ARE SUBMERGED.
Inventors
- 👤 John W Moffett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:45
CPC Classifications
B; B01; B01D; B01D24/00; B01D24/02; B01D24/20; B01D24/205; B01D24/46; B01D24/4605; B01D24/4621
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |