Patent US3631983A successfully refreshed from Google Patents.
US3631983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for backwashing filters
Assignee: Cameron Solutions Inc
•
Filing: 1970-05-25
•
Granted: 1972-01-04
•
Expires: 1990-05-25
Abstract
Abstract A vertical vessel has a filter bed disposed in its lower portion for normal filtering of solid particulates from contaminated liquid passed down through the bed. Vertical passages are formed to extend below the upper surface of the filter bed with a layer of smooth-surfaced bodies arranged to reduce the cross-sectional area of the vessel to impart desired velocity to the particulates in the liquid. Conduits are provided to flow liquid and gas up through the bed to backwash particulates from the bed into a collection above the bed which is removed by a siphon in a batch operation.
Inventors
- 👤 Isaac Paul Mail
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:04
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: 3
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.
Claim 2
Dependent Claim
23 words
The method of claim 1, in which, the gas displacing the liquid above the bed through the siphon is air at atmospheric pressure.
Claim 3
Dependent Claim
21 words
The method of claim 1, in which, the gas displacing the liquid above the bed through the siphon is under pressure.
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) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |