US3680702A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter cleaning system
Assignee: Individual
•
Filing: 1970-11-09
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Granted: 1972-08-01
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Expires: 1990-11-09
Abstract
Abstract Pressure leaf filter apparatus having parallel vertically arranged filters with sluicing pipes on opposite sides of the filter for directing a high pressure spray of sluice liquid against the suspended solids cake formed on each filter. The sluicing pipes are pivoted with butterfly-type synchronized oscillation to provide an undercutting action on the cake as both pipes move upwardly.
Inventors
- 👤 Seymour Weinstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:21
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/39; B01D29/62; B01D29/64; B01D29/6438; B01D29/6446
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
46 words
Apparatus as described in claim 1 in which said means for providing synchronized movement comprises a pair of meshed gears each of which is fastened to a different one of the headers, said pivot means comprising motor driven means fastened to one of said meshed gears.
Claim 2
Independent Claim
99 words
A method of removing the suspended solids cake formed on the filters of pressure leaf filter apparatus comprising the steps of: removing from the apparatus the unfiltered liquid, providing sluicing pipes on opposite sides of the filters, and moving the sluicing pipes in butterfly-type oscillation and synchronism, to introduce a high pressure spray of sluice liquid against the cake formed on each filter and provide an undercutting action on the cake as both sluicing pipes move upwardly in synchronism to thereby weaken the cakes so that they fall when the pipes move in the directions toward their uppermost positions.
Claim 3
Dependent Claim
111 words
In a sluicing apparatus for removing solids from leaf filters that are arranged in parallel spaced upright relationship to lie transverse to the longitudinal axis of an elongated tank through which liquid is being pumped under pressure, the improvement in such sluicing apparatus comprising, in combination: a pair of elongated liquid-carrying headers extending parallel to the longitudinal axis of said tank, nozzles operatively associated with each header for directing sluicing liquid as desired toward the filter leaves, and means for providing synchronized butterfly-type oscillation of said headers whereby they will move in synchronism while being disposed at equal angles with respect to a vertical plane that intersects the said filter leaves.
Claim 4
Dependent Claim
54 words
Apparatus of claim 4 wherein the headers are arranged to move outwardly and upwardly to provide an undercutting action on the cakes of solids as both headers move upwardly in synchronism, to thereby weaken said cakes of solids so that they will fall as the headers move in the directions toward their uppermost positions.
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) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |