US5401406A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter assembly having a filter element and a sealing device
Assignee: Pall Corp
•
Filing: 1992-12-11
•
Granted: 1995-03-28
•
Expires: 2012-12-11
Abstract
Abstract The present invention provides a filter sealing device for a filter element. The filter element includes an end portion defining an opening. The sealing device includes a body having a first section attached to a second section. The first section is positionable within the opening in the filter element with the second section facing an open end portion of the filter element. The first section has a larger coefficient of thermal expansion than the end portion of the filter element so that an increase in temperature results in the first section of the body expanding at a greater rate than the end portion of the filter element. These differing rates of expansion cause a compressive force to be exerted between the first section of the body and the end portion of the filter element.
Inventors
- 👤 Mark W. Johnson
- 👤 Stephen A. Geibel
- 👤 Tanweer Haq
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:19
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/0002; B01D46/0005; B01D29/00; B01D29/11; B01D29/31; B01D29/33; B01D29/50; B01D29/52; B01D29/62; B01D29/66; B01D29/88; B01D29/92; B01D29/925; B01D46/24; B01D46/2403; B01D46/2407; B01D46/42; B01D46/4281; B01D46/56; B01D46/58; B01D2201/00; B01D2201/04; B01D2201/043; B01D2201/0446; B01D2201/34; B01D2271/00; B01D2271/02; B01D2271/022; B01D2271/027; B01D2273/00; B01D2273/20
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
164 words
A filter assembly comprising: a sealing device having first and second surfaces; a filter element having a first surface disposed about the first surface of the sealing device and a second surface adjacent to the second surface of the sealing device, the filter element having a coefficient of thermal expansion differing from the coefficient of thermal expansion of the sealing device; and a compressible material disposed between the first surface of the filter element and the first surface of the sealing device and between the second surface of the filter element and the second surface of the sealing device wherein the sealing device, the filter element, and the compressible material comprise sealing means for compressing the compressible material between the second surfaces at a first temperature, for compressing the compressible material between the first surfaces at a second temperature higher than the first temperature, and for forming a seal at both the first and second temperatures responsive to the differing coefficients of thermal expansion.
Claim 2
Dependent Claim
164 words
A filter assembly comprising: a sealing device having first and second surfaces; a filter element having a first surface disposed about the first surface of the sealing device and a second surface adjacent to the second surface of the sealing device, the filter element having a coefficient of thermal expansion differing from the coefficient of thermal expansion of the sealing device; and a compressible material disposed between the first surface of the filter element and the first surface of the sealing device and between the second surface of the filter element and the second surface of the sealing device wherein the sealing device, the filter element, and the compressible material comprise sealing means for compressing the compressible material between the second surfaces at a first temperature, for compressing the compressible material between the first surfaces at a second temperature higher than the first temperature, and for forming a seal at both the first and second temperatures responsive to the differing coefficients of thermal expansion.
Claim 3
Dependent Claim
15 words
The filter assembly as claimed in claim 1 wherein the filter element comprises a ceramic.
Claim 4
Dependent Claim
43 words
The filter assembly as claimed in claim 1 including: a tank; and an member disposed within the tank for dividing the tank between an inlet portion and an outlet portion wherein the sealing device and the filter element are coupled to the member.
Claim 5
Dependent Claim
28 words
The filter assembly as claimed in claim 1 wherein the sealing device is a tube sheet, the filter element being disposed in an aperture in the tube sheet.
Claim 6
Dependent Claim
22 words
The filter assembly as claimed in claim 1 wherein the sealing device is disposed within an annular groove within the filter element.
Claim 7
Dependent Claim
18 words
The filter assembly as claimed in claim 1 wherein the compressible material comprises a high temperature gasket material.
Claim 8
Dependent Claim
23 words
The filter assembly device as claimed in claim 1 wherein the sealing device is disposed within an internal cavity within the filter element.
Claim 9
Dependent Claim
25 words
The filter assembly as claimed in claim 1 wherein the filter element has a closed end, an open end, and defines an internal cavity therebetween.
Claim 10
Dependent Claim
24 words
The filter assembly as claimed in claim 1 wherein the sealing device comprises a metal and the filter element comprises a ceramic candle filter.
Claim 11
Dependent Claim
17 words
The filter assembly as claimed in claim 9 wherein the first and second surfaces are substantially orthogonal.
Claim 12
Dependent Claim
51 words
The filter assembly as claimed in claim 1 wherein the sealing device has a first section having a cylinder-shaped configuration and a second section having a disk-shaped configuration coaxially mounted to the first section, an outer diameter of the first section being less than the outer diameter of the second section.
Claim 13
Dependent Claim
21 words
The filter assembly as claimed in claim 1 wherein the first section has an internal passage defining a fluid flow path.
Claim 14
Dependent Claim
19 words
The filter assembly as claimed in claim 12 wherein the internal passage includes means for increasing back flow efficiency.
Claim 15
Dependent Claim
41 words
The filter assembly as claimed in claim 1 wherein the compressible material compressed between the second surfaces has a first compressive force at the first temperature and a second compressive force, less than the first compressive force, at the second temperature.
Claim 16
Dependent Claim
41 words
The filter assembly as claimed in claim 14 wherein the compressible material compressed between the first surfaces has a first compressive force at the first temperature and a second compressive force, greater than the first compressive force, at the second temperature.
Claim 17
Dependent Claim
148 words
A filter assembly comprising: a filter element having a porous ceramic tube having a flange including an annular groove, the annular groove having an inner periphery sidewall facing away from the center axis and an outer periphery sidewall facing the center axis; and an annular metal sealing device removably disposed within the annular groove wherein a distance between the outer periphery side wall and the annular metal sealing device decreases with increasing temperature, the filter element having a coefficient of thermal expansion differing from a coefficient of thermal expansion of the annular metal sealing device, wherein the annular metal sealing device and the filter element comprise sealing means responsive to differing coefficients of thermal expansion between the filter element and the annular metal sealing device, to a positioning of the annular metal sealing device and the ceramic filter, and to an increase in temperature of the filter assembly.
Claim 18
Dependent Claim
148 words
A filter assembly comprising: a filter element having a porous ceramic tube having a flange including an annular groove, the annular groove having an inner periphery sidewall facing away from the center axis and an outer periphery sidewall facing the center axis; and an annular metal sealing device removably disposed within the annular groove wherein a distance between the outer periphery side wall and the annular metal sealing device decreases with increasing temperature, the filter element having a coefficient of thermal expansion differing from a coefficient of thermal expansion of the annular metal sealing device, wherein the annular metal sealing device and the filter element comprise sealing means responsive to differing coefficients of thermal expansion between the filter element and the annular metal sealing device, to a positioning of the annular metal sealing device and the ceramic filter, and to an increase in temperature of the filter assembly.
Claim 19
Dependent Claim
30 words
The filter assembly of claim 16 including a compressible material disposed between the annular metal sealing device and the annular groove, wherein the compressible material is compressed at elevated temperatures.
Claim 20
Dependent Claim
38 words
The filter assembly as claimed in claim 17 wherein the compressible material is disposed between an outer facing peripheral side wall of the annular metal sealing device and an inner facing peripheral side wall of the annular groove.
Claim 21
Dependent Claim
205 words
A filter assembly for filtering high temperature gases, the filter assembly comprising: a tank; a tube sheet disposed within the tank and dividing the tank between an inlet portion and an outlet portion, the tube sheet including a sealing device having first and second surfaces disposed about an aperture in the tube sheet; a ceramic candle filter element having first and second annular surfaces respectively disposed about the first surface of the sealing device and adjacent to the second surface of the sealing device wherein the ceramic candle filter element has a coefficient of thermal expansion that differs from a coefficient of thermal expansion of the sealing device; a compressible material respectively disposed between the first and second surfaces of the filter element and the first and second surfaces of the sealing device wherein the sealing device, the ceramic candle filter, and the compressible material comprise sealing means responsive to the differing coefficients of thermal expansion and the positioning of the sealing device, the ceramic filter, and the compressible material, the sealing means for compressing the compressible material between the first and second surfaces at a first temperature, the compression between the first surfaces increasing responsive to an increase in temperature above the first temperature.
Claim 22
Dependent Claim
205 words
A filter assembly for filtering high temperature gases, the filter assembly comprising: a tank; a tube sheet disposed within the tank and dividing the tank between an inlet portion and an outlet portion, the tube sheet including a sealing device having first and second surfaces disposed about an aperture in the tube sheet; a ceramic candle filter element having first and second annular surfaces respectively disposed about the first surface of the sealing device and adjacent to the second surface of the sealing device wherein the ceramic candle filter element has a coefficient of thermal expansion that differs from a coefficient of thermal expansion of the sealing device; a compressible material respectively disposed between the first and second surfaces of the filter element and the first and second surfaces of the sealing device wherein the sealing device, the ceramic candle filter, and the compressible material comprise sealing means responsive to the differing coefficients of thermal expansion and the positioning of the sealing device, the ceramic filter, and the compressible material, the sealing means for compressing the compressible material between the first and second surfaces at a first temperature, the compression between the first surfaces increasing responsive to an increase in temperature above the first temperature.
Claim 23
Dependent Claim
178 words
A filter assembly for filtering high temperature gases, the filter assembly comprising: a porous ceramic tubular filter element having a center axis and an annular flange disposed about the center axis, the annular flange including an annular groove, the annular groove having an inner periphery sidewall facing away from the center axis and an outer periphery sidewall facing the center axis; an annular metal sealing device removably disposed within the annular groove; and a compressible material disposed between the annular metal sealing device and the annular groove wherein a compression of the compressible material increases with increasing temperatures, the porous ceramic tubular filter element having a coefficient of thermal expansion differing from a coefficient of thermal expansion of the annular metal sealing device, wherein the annular metal sealing device, the compressible material, and the porous ceramic tubular filter element comprise sealing means for forming a compressive seal between the annular metal sealing device and the porous ceramic tubular filter element responsive to differing coefficients of thermal expansion in combination with an increase in temperature of the filter assembly.
Claim 24
Dependent Claim
178 words
A filter assembly for filtering high temperature gases, the filter assembly comprising: a porous ceramic tubular filter element having a center axis and an annular flange disposed about the center axis, the annular flange including an annular groove, the annular groove having an inner periphery sidewall facing away from the center axis and an outer periphery sidewall facing the center axis; an annular metal sealing device removably disposed within the annular groove; and a compressible material disposed between the annular metal sealing device and the annular groove wherein a compression of the compressible material increases with increasing temperatures, the porous ceramic tubular filter element having a coefficient of thermal expansion differing from a coefficient of thermal expansion of the annular metal sealing device, wherein the annular metal sealing device, the compressible material, and the porous ceramic tubular filter element comprise sealing means for forming a compressive seal between the annular metal sealing device and the porous ceramic tubular filter element responsive to differing coefficients of thermal expansion in combination with an increase in temperature of the filter assembly.
Claim 25
Dependent Claim
36 words
The filter assembly as claimed in claim 20 wherein the compressible material is disposed between an outer peripheral side wall of the annular metal sealing device and the outer peripheral side wall of the annular groove.
References Cited (Backward Citations)
US2526651A
Cited
US2514366A
Cited
US2548875A
Cited
USRE24954E
Cited
US3055745A
Cited
US2948555A
Cited
US2892510A
Cited
US3436898A
Cited
US3436341A
Cited
US3503516A
Cited
US3768661A
Cited
US3642141A
Cited
US3780868A
Cited
US3924863A
Cited
US4105562A
Cited
US4186101A
Cited
US4251680A
Cited
US4336035A
Cited
US4461707A
Cited
US4449422A
Cited
US4522719A
Cited
US4615261A
Cited
WO1986005118A1
Cited
US4673187A
Cited
US4728423A
Cited
US4645596A
Cited
US4889630A
Cited
US4725356A
Cited
US4885014A
Cited
US4813342A
Cited
US4713174A
Cited
US4770772A
Cited
US4735638A
Cited
EP0345491A2
Cited
US4979969A
Cited
US4886533A
Cited
US4946487A
Cited
US4909813A
Cited
US5004545A
Cited
US5037115A
Cited
US5037461A
Cited
US4960448A
Cited
US5059227A
Cited
JPH03186311A
Cited
EP0446422A1
Cited
US5171337A
Cited
US5223012A
Cited
DE9014198U1
Cited
US5185019A
Cited
US5080557A
Cited
US5223138A
Cited
US5205850A
Cited
US5209844A
Cited
US5202021A
Cited
DE9216259U1
Cited
GB2262053A
Cited
US5296010A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-03-27 | 1998-09-26 | 1999-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-27 | 2002-09-26 | 2003-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-27 | 2006-09-26 | 2007-03-28 | $7700.00 | Window Closed / Lapsed |