US3767048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for filtering liquid
Assignee: Aqseptence Group GmbH
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Filing: 1971-08-20
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Granted: 1973-10-23
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Expires: 1991-08-20
Abstract
Abstract A method and apparatus for filtering liquids in which the liquid to be filtered is passed upwardly through a downwardly moving filter bed of granular filter material. The effective crosssection of the filter bed bottom is increased by forming up into this bottom a cavity into which the liquid is introduced for passage through the bed, and through which the lowermost granular filter material of the bed is removed. The cavity may be formed structurally with fixed, annular, conically arranged supports between which the granular filter material and the liquid pass downwardly and upwardly, respectively.
Inventors
- 👤 H Prengemann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:52
CPC Classifications
B; B01; B01J; B01J47/00; B01J47/10; B01D; B01D24/00; B01D24/28; B01D24/30; B01D24/46; B01D24/4668; B01D24/4689; B01D37/00; B01D37/03
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
13 words
An apparatus according to claim 1, wherein the said cavity is generally conical.
Claim 2
Dependent Claim
46 words
An apparatus according to claim 2, wherein the said wall of the cavity is formed by a plurality of annular supports fixed relative to the housing and located one above the other and by the sloping walls of the granular filter material piled between the supports.
Claim 3
Dependent Claim
12 words
An apparatus according to clAim 3, wherein the said supports are perforated.
Claim 4
Dependent Claim
27 words
An apparatus according to claim 3, wherein the said annular supports are arranged co-axially one above the other, their internal and external diameters diminishing towards the top.
Claim 5
Dependent Claim
23 words
An apparatus according to claim 3, wherein the supports are attached to said housing by bars extending from the supports to the housing.
Claim 6
Dependent Claim
28 words
An apparatus according to claim 3, wherein one of said supports is attached to the housing and the other said supports are attached to the said one support.
Claim 7
Dependent Claim
22 words
An apparatus according to claim 3, wherein each support is fitted with a vertically extending flange-like rim extending about its outer periphery.
Claim 8
Dependent Claim
46 words
An apparatus according to claim 8, including a drive shaft inside of the cavity and connected to the scraper blades to turn the same, said drive shaft being conical, narrowing upwardly, and wherein the means for introducing the liquid introduces the same above the drive shaft.
Claim 9
Dependent Claim
30 words
An apparatus according to claim 3, wherein the means for removing the granular filter material comprises scraper arms extending onto the supports for the cavity and movable around the supports.
Claim 10
Dependent Claim
22 words
An apparatus according to claim 1, wherein the means for introducing the liquid introduces the same into the top of the cavity.
Claim 11
Dependent Claim
37 words
An apparatus according to claim 11, including flow deflecting means inside the cavity for calming the liquid and uniformly distributing the liquid into the granular filter material of the filter bed forming the wall of the cavity.
Claim 12
Dependent Claim
57 words
An apparatus according to claim 1, including a settling surface formed at the lower part of the housing beneath the cavity, such that solid material falling from the cavity falls onto this settling surface, and an outlet opening formed in the settling surface and means for scraping solid material from the settling surface into the outlet opening.
Claim 13
Dependent Claim
87 words
An apparatus according to claim 13, wherein the means for removing granular filter material comprises scraper arms extending onto the supports from within the cavity, and including a drive shaft located inside the cavity and connected to said scraper blades to turn the same, and wherein said means for scraping solid material includes a further scraping device and including a second drive means located inside the cavity and operable independently of the said scraping blade driving means for driving the said scaping device of the settling surface.
Claim 14
Dependent Claim
65 words
An apparatus according to claim 14, wherein the drive shaft for the scraper blades of the supports is conical, narrowing upwardly, and said second drive means includes a drive shaft in the shape of a truncated cone forming a further downward extension of said conical drive shaft and wherein the means for introducing liquid introduces the same into the said cavity above the drive shaft.
Claim 15
Dependent Claim
38 words
An apparatus according to claim 13, said outlet being connected to a pipe which extends upwardly to hold liquid up to a height at least as great as the said given level of liquid in the filter bed.
Claim 16
Dependent Claim
20 words
An apparatus according to claim 16, said pipe including a conveyor which includes means for partially dewatering the removed solids.
Claim 17
Dependent Claim
25 words
An apparatus according to claim 17, the conveyor being a worm having a vertical axis with a perforated surface whereby the water can pass therethrough.
Claim 18
Dependent Claim
42 words
An apparatus according to claim 1, including at least one horizontal pipe located in the upper part of the filter bed for withdrawing filtrate liquid therefrom, the intake end of said pipe being covered by a cap open at its lower end.
Claim 19
Independent Claim
196 words
A method of filtering liquid in a filter of the type wherein granular filter material forming a filter bed passes downwardly through a housing while the liquid to be filtered passes upwardly through the bed and is removed at the upper part of the housing, said method comprising the steps of: enlarging the effective cross-section of the open bottom of the filter bed relative to the cross-section of the bed taken in a horizontal plane paSsing therethrough by forming in the bottom of the filter bed a cavity which extends upwardly and inwardly thereinto reducing in cross-section upwardly and inwardly , with the granular filter material forming a part of the wall of the cavity, introducing the liquid to be filtered from above downwardly into the cavity such that the kinetic energy thereof causes at least some of any solid particles in the incoming liquid to continue to move downwardly through the open bottom of the cavity, and redirecting the liquid upwardly through the said cavity wall and up through the filter bed, and removing from the filter bed through the cavity and then through the open bottom granular filter material forming the said cavity wall.
Claim 20
Dependent Claim
24 words
The method of claim 20, wherein the cavity is generally conical and the liquid is introduced downwardly into the apex of the conical cavity.
Claim 21
Dependent Claim
13 words
The method of claim 20, including introducing the liquid to be treated intermittently.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |