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Patent US3698554A successfully refreshed from Google Patents.
US3698554A
Expired / Lapsed
US
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Method for backwashing filters
Assignee: Cameron Solutions Inc
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Filing: 1970-04-27
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Granted: 1972-10-17
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Expires: 1990-04-27
Abstract
Abstract A filter bed is backwashed in a batch operation with backwash fluid and gas to dislodge particulates from the bed. The flow of gas is terminated, and the gas is flushed from the bed by additional amounts of backwash fluid. After a settling period, the backwash fluid and the dislodged particulates are siphoned from above the filter bed.
Inventors
- 👤 Isaac Paul Mail
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:02
CPC Classifications
B; B01; B01D; B01D24/00; B01D24/007; B01D24/008; B01D24/02; B01D24/10; B01D24/12; B01D24/46; B01D24/4631; B01D24/4694; B01D2201/00; B01D2201/18; B01D2201/188
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
21 words
The method of claim 1, including, repeating the cycle of claim 1 until the bed is clean enough for filtering service.
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) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |