US4973404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Micro/ultra filtration system
Assignee: Aurian Corp
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Filing: 1989-09-05
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Granted: 1990-11-27
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Expires: 2009-09-05
Abstract
Abstract A filtration apparatus characterized by efficiency of the precoating step and maintenance of filtration performance over a long period of time after precoating has been completed. The filter promotes parallel flow of porous precoat material along a porous septum, thereby achieving efficient stacking of this material against the septum. A dual-speed pumping system transmits the precoat material to the septum at high velocity, thereby further encouraging efficient stacking, but pumps the fluid to be filtered at a lower velocity to minimize energy consumption.
Inventors
- 👤 Roland E. Weber
- 👤 John J. Pavlovich
- 👤 Lawrence K. Wang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:14
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/114; B01D29/62; B01D29/66; B01D29/88; B01D29/90; B01D29/902; B01D29/92; B01D29/925; B01D37/00; B01D37/02
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
143 words
A precoat filter element comprising: a. a vessel having an inner wall; b. inlet means for admitting fluid into said vessel; c. outlet means for discharging fluid out of said vessel; d. a porous septum disposed in the flow path between said inlet means and said outlet means, a wall of said septum having a predetermined spacing from the inner wall to form therebetween a chamber communicating with said inlet means; e. means for providing, for a fluid containing porous particles of various sizes and passing through said chamber, a ratio of velocity parallel to said septum wall to velocity perpendicular to said septum wall sufficient to cause larger porous particles contained within said fluid to reach said outer wall prior to smaller porous particles contained within said fluid; and f. means for communicating with a pump for pumping fluid through said chamber.
Claim 2
Dependent Claim
143 words
A precoat filter element comprising: a. a vessel having an inner wall; b. inlet means for admitting fluid into said vessel; c. outlet means for discharging fluid out of said vessel; d. a porous septum disposed in the flow path between said inlet means and said outlet means, a wall of said septum having a predetermined spacing from the inner wall to form therebetween a chamber communicating with said inlet means; e. means for providing, for a fluid containing porous particles of various sizes and passing through said chamber, a ratio of velocity parallel to said septum wall to velocity perpendicular to said septum wall sufficient to cause larger porous particles contained within said fluid to reach said outer wall prior to smaller porous particles contained within said fluid; and f. means for communicating with a pump for pumping fluid through said chamber.
Claim 3
Dependent Claim
34 words
The filter element of claim 1 wherein the spacing between the outer wall of said septum and the inner wall of said vessel is sufficiently large to retain adequate fluid throughput through said element.
Claim 4
Dependent Claim
47 words
The filter element of claim 1 wherein the spacing between the outer wall of said septum and the inner wall of said vessel is such that the ratio of the area thereof to the cross-sectional area of the interior of said septum is no greater than 1:3.
Claim 5
Dependent Claim
23 words
The filter element of claim 1 wherein the ratio of the height of said septum to the inner diameter thereof is approximately 7:1.
Claim 6
Dependent Claim
27 words
The filter element of claim 1 wherein the cross-sectional area of said outlet means is at least 60% greater than the cross-sectional area of said inlet means.
Claim 7
Dependent Claim
19 words
The filter element of claim 1 wherein the diameter of the pores of said septum is approximately 20 microns.
Claim 8
Dependent Claim
20 words
The filter element of claim 1 wherein the diameter of the pores of said septum is at least 0.5 micron.
Claim 9
Dependent Claim
18 words
The filter element of claim 1 further comprising a flow plug secured to each end of said septum.
Claim 10
Dependent Claim
26 words
The filter element of claim 1 further comprising pumping means capable of delivering fluid to said inlet means at one of at least two flow rates.
Claim 11
Dependent Claim
16 words
The filter element of claim 9 wherein at least one velocity is at least 10 ft/sec.
Claim 12
Dependent Claim
18 words
A filtration system comprising at least one filter element according to claim 1, and further comprising vibrator means.
Claim 13
Dependent Claim
26 words
The filtration system of claim 11 further comprising means for reducing the pressure difference between the inside of the septum and the outside of the septum.
Claim 14
Dependent Claim
23 words
The filtration system of claim 11 further comprising means for introducing fluid in a direction tangential to the outer wall of said septum.
Claim 15
Dependent Claim
10 words
The filtration system of claim 11 further comprising heating means.
Claim 16
Dependent Claim
95 words
A percent filter element comprising: a. a vessel having an inner wall; b. inlet means for discharging fluid into said vessel; c. outlet means for discharging fluid out of said vessel; d. a porous septum disposed in the flow path between said inlet means and said outlet means; and e. means for communicating with a pump for pumping fluid through said chamber, said communication means being of sufficient length to facilitate separation, by flowing stream of particles introduced at the pump end of said communication means prior to entry of said particles into said vessel.
Claim 17
Dependent Claim
95 words
A percent filter element comprising: a. a vessel having an inner wall; b. inlet means for discharging fluid into said vessel; c. outlet means for discharging fluid out of said vessel; d. a porous septum disposed in the flow path between said inlet means and said outlet means; and e. means for communicating with a pump for pumping fluid through said chamber, said communication means being of sufficient length to facilitate separation, by flowing stream of particles introduced at the pump end of said communication means prior to entry of said particles into said vessel.
Claim 18
Dependent Claim
34 words
The filter element of claim 15 wherein the spacing between the outer wall of said septum and the inner wall of said vessel is sufficiently large to retain adequate fluid throughput through said element.
Claim 19
Dependent Claim
47 words
The filter element of claim 15 wherein the spacing between the outer wall of said septum and the inner wall of said vessel is such that the ratio of the area thereof to the cross-sectional area of the interior of said septum is no greater than 1:3.
Claim 20
Dependent Claim
23 words
The filter element of claim 15 wherein the ratio of the height of said septum to the inner diameter thereof is approximately 7:1.
Claim 21
Dependent Claim
27 words
The filter element of claim 15 wherein the cross-sectional area of said outlet means is at least 60% greater than the cross-sectional area of said inlet means.
Claim 22
Dependent Claim
19 words
The filter element of claim 15 wherein the diameter of the pores of said septum is approximately 20 microns.
Claim 23
Dependent Claim
20 words
The filter element of claim 15 wherein the diameter of the pores of said septum is at least 0.5 micron.
Claim 24
Dependent Claim
18 words
The filter element of claim 15 further comprising a flow plug secured to each end of said septum.
Claim 25
Dependent Claim
25 words
The filter element of claim 15 further comprising a pump capable of delivering fluid to said inlet means at one of at least two velocities.
Claim 26
Dependent Claim
16 words
The filter element of claim 23 wherein at least one velocity is at least 10 ft/sec.
Claim 27
Dependent Claim
18 words
A filtration system comprising at least one filter element according to claim 15, and further comprising vibrator means.
Claim 28
Dependent Claim
26 words
The filtration system of claim 25 further comprising means for reducing the pressure difference between the inside of the septum and the outside of the septum.
Claim 29
Dependent Claim
23 words
The filtration system of claim 25 further comprising means for introducing fluid in a direction tangential to the outer wall of said septum.
Claim 30
Dependent Claim
10 words
The filtration system of claim 25 further comprising heating means.
References Cited (Backward Citations)
US3501060A
Cited
US3422958A
Cited
US3488768A
Cited
US3680699A
Cited
US3974068A
Cited
US4028232A
Cited
US4187174A
Cited
US4346011A
Cited
US4427554A
Cited
US4526688A
Cited
US4407720A
Cited
US4560483A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-11-26 | 1994-05-28 | 1994-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-26 | 1998-05-28 | 1998-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-26 | 2002-05-28 | 2002-11-27 | $7700.00 | Window Closed / Lapsed |