US3655049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for retaining and dislodging filter cake
Assignee: Sparkler Manufacturing Co
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Filing: 1970-11-19
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Granted: 1972-04-11
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Expires: 1990-11-19
Abstract
Abstract A porous screen fitted adjacent a vertical plate filter, in close proximity therewith, and means for oscillating or agitating the screen are provided, so that the screen acts to dislodge the filter cake which builds up on the filter plate. A method of dislodging a filter cake is provided which includes oscillation of a screen located adjacent a vertical plate filter having filtering media thereon for filtering fluids, and then continued oscillation of the screen while at the same time expanding the filtering media toward the screen and washing the filtering media with water.
Inventors
- 👤 Aloysius C Kracklauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:08
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/39; B01D29/62; B01D29/64; B01D29/6438; B01D29/70; B01D29/72; B01D2201/00; B01D2201/20; B01D2201/202
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
46 words
Apparatus in accordance with claim 1, wherein said retaining means comprises a frame and an expanded metal screen affixed to said frame around the periphery thereof, and wherein said means for receipt of said oscillating means comprises bracket members affixed to each side of said frame.
Claim 2
Dependent Claim
18 words
Apparatus in accordance with claim 1, wherein said oscillating means comprise eccentric longitudinal rods driven by motive means.
Claim 3
Dependent Claim
151 words
Apparatus for use in filtering fluids comprising in combination with a filter tank and at least one vertical filter plate positioned in said tank: porous screen means adjacent said filter plate, said screen means covering substantially the complete effective filtration area of said filter plate, and said screen being laterally spaced from the surface of said filter plate by a distance which is less than the thickness of the filter cake which builds up on said surface of said filter plate; members on said screen means for receIpt of longitudinal rods; at least one eccentric longitudinal rod operably connected to such member on each side of said screen means; motive means for rotating said eccentric rods, whereupon said screen means are oscillated; said screen means being effective upon oscillation to dislodge filter cake from said filter plate, but being effective at other times to retain filter cake on said filter plate.
Claim 4
Dependent Claim
231 words
Apparatus for use in filtering fluids which comprises in combination with a filter tank and at least one vertical filter plate having a filtering media, disposed in said filter tank: porous screen means adjacent said filter plate, said screen means covering substantially the complete effective filtration area of said filter plate and said screen being laterally spaced from the surface of said filter plate by a distance which is less than the thickness of the filter cake which builds up on said surface of said filter plate; means on said screen means for receipt of oscillating means; oscillating means which may be selectively oscillated when desired to oscillate said screen means; washing means for ejecting a suitable cleansing fluid upon said filter plate simultaneously with oscillation of said screen; and means for introducing a compressed gas into the interior of said filter plate to expand the filtering media of said filter plate outwardly toward engagement of said filtering media with said screen means, simultaneously with oscillation of said screen, said screen means being effective upon oscillation to dislodge filter cake from said filter plate, but being effective at other times to retain filter cake on said filter plate, and said screen means, said washing means and said means for introducing gas being effective in combination to obtain complete and efficient cleaning of said filter plate without damage to said filtering media.
Claim 5
Dependent Claim
46 words
Apparatus in accordance with claim 5, wherein said retaining means comprises a frame and an expanded metal screen affixed to said frame around the periphery thereof, and wherein said means for receipt of said oscillating means comprise bracket members affixed to each side of said frame.
Claim 6
Dependent Claim
18 words
Apparatus in accordance with claim 5, wherein said oscillating means comprise eccentric longitudinal rods driven by motive means.
Claim 7
Independent Claim
120 words
A method of dislodging a filter cake from a vertical filter plate in a filter tank said filter plate having a filtering media comprising: providing a porous screen and means for oscillating said screen; positioning said screen adjacent said filter plate so that the distance there-between is less than the desired thickness of the filter cake on said filter plate; oscillating said screen to remove the greatest portion of said filter cake; continuing oscillation of said screen while at the same time expanding the filtering media of said filter plate toward engagement with said screen, and ejecting a stream of cleansing fluid onto said media, thereby to completely and efficiently clean said filtering media and prepare it for further filtration.
References Cited (Backward Citations)
US3447690A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |