Patent US3984986A successfully refreshed from Google Patents.
Patent US4293414A successfully refreshed from Google Patents.
US4293414A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slotted sheet filter element
Assignee: Ecodyne Corp
•
Filing: 1979-11-07
•
Granted: 1981-10-06
•
Expires: 1999-11-07
Abstract
Abstract A filter element adapted to be precoated with a filter medium, having a porous tubular core, and a means supporting the filter medium precoat including a discontinuously slotted sheet arranged concentrically about the tubular core. Each of the slots has an elongated configuration, and provides an absolute particle retention ability of less than 50 microns while reducing gas entrapment in the filter element. According to an additional embodiment of the invention, the filter element includes a porous tubular core, a means for supporting the filter medium precoat terminating a distance from an end of the tubular core so that a relatively low bubble pressure element section is defined, and a discontinuously slotted sheet means positioned over the relatively low bubble point pressure element section and sealed to the precoat support means. Additional embodiments include a vent sleeve having an aperture positioned over the discontinuously slotted sheet means, wherein the slotted sheet means is a band or disc of slotted sheet material.
Inventors
- 👤 Joseph F. Gianneli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:21
CPC Classifications
B; B01; B01D; B01D37/00; B01D37/02; B01D29/00; B01D29/11; B01D29/114; B01D29/50; B01D29/52; B01D29/62; B01D29/66; B01D36/00; B01D36/001; B01D2201/00; B01D2201/04; B01D2201/043; B01D2201/0446
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
67 words
A filter element, adapted to be precoated with a filter medium, comprising: a porous tubular core; means supporting the filter medium precoat, said means including a discontinuously slotted sheet arranged concentrically about said tubular core, each of said slots having an absolute particle retention ability less than about 50 microns, and an elongated configuration whereby gas entrapment in the filter element during precoating and filtration is reduced.
Claim 2
Dependent Claim
67 words
A filter element, adapted to be precoated with a filter medium, comprising: a porous tubular core; means supporting the filter medium precoat, said means including a discontinuously slotted sheet arranged concentrically about said tubular core, each of said slots having an absolute particle retention ability less than about 50 microns, and an elongated configuration whereby gas entrapment in the filter element during precoating and filtration is reduced.
Claim 3
Dependent Claim
31 words
The filter element of claim 1 wherein the width of each slot is up to about 30 microns and the length of each slot is between about 45 and 430 microns.
Claim 4
Dependent Claim
29 words
The filter element of claim 1 wherein the length of each of said slots is at least about one and one-half times the width of each of said slots.
Claim 5
Dependent Claim
35 words
The filter element of claim 1 wherein said filter element has an absolute particle retention ability of less than about 30 microns and a bubble point pressure of less than about 6.9 inches of water.
Claim 6
Dependent Claim
65 words
In a liquid filtering apparatus including a filter tank, a plate separating said tank into an influent compartment and a filtrate compartment, at least one filter element comprising: a vertically extending porous tubular core element; and a discontinuously slotted sheet means positioned about said tubular core for supporting a filter medium, wherein the slots are elongated, having a width of about 50 microns or less.
Claim 7
Dependent Claim
65 words
In a liquid filtering apparatus including a filter tank, a plate separating said tank into an influent compartment and a filtrate compartment, at least one filter element comprising: a vertically extending porous tubular core element; and a discontinuously slotted sheet means positioned about said tubular core for supporting a filter medium, wherein the slots are elongated, having a width of about 50 microns or less.
Claim 8
Dependent Claim
80 words
A filter element adapted to be precoated with a filter medium of finely divided ion exchange resin particles smaller than about 250 microns, comprising: a porous tubular core; a coarse screen positioned about said tubular core; and a slotted sheet positioned about said coarse screen, said sheet having a plurality of discontinuous slots, each slot having a width of up to about 50 microns and a length of at least about one and one-half times the width of the slot.
Claim 9
Dependent Claim
80 words
A filter element adapted to be precoated with a filter medium of finely divided ion exchange resin particles smaller than about 250 microns, comprising: a porous tubular core; a coarse screen positioned about said tubular core; and a slotted sheet positioned about said coarse screen, said sheet having a plurality of discontinuous slots, each slot having a width of up to about 50 microns and a length of at least about one and one-half times the width of the slot.
Claim 10
Dependent Claim
112 words
A filter element adapted to be precoated with a filter medium, comprising: a porous tubular core; means for supporting the filter medium precoat, said precoat support means positioned about said tubular core and terminating a distance from an end of said tubular core so that a relatively low bubble point pressure element section is defined; and discontinuously slotted sheet means positioned over the relatively low bubble point pressure element section and sealed to said precoat support means, said discontinuously slotted sheet means having elongated slots, each slot having a width of up to about 50 microns and a length of at least about one and one-half times the width of the slot.
Claim 11
Dependent Claim
112 words
A filter element adapted to be precoated with a filter medium, comprising: a porous tubular core; means for supporting the filter medium precoat, said precoat support means positioned about said tubular core and terminating a distance from an end of said tubular core so that a relatively low bubble point pressure element section is defined; and discontinuously slotted sheet means positioned over the relatively low bubble point pressure element section and sealed to said precoat support means, said discontinuously slotted sheet means having elongated slots, each slot having a width of up to about 50 microns and a length of at least about one and one-half times the width of the slot.
Claim 12
Dependent Claim
32 words
The filter element of claim 7 further comprising a vent sleeve positioned over and attached to said slotted sheet means, said vent sleeve having an aperture covered by said slotted sheet means.
Claim 13
Dependent Claim
107 words
A filter element adapted to be precoated with a filter medium, comprising: a porous tubular core; means for supporting the filter medium precoat, said precoat support means positioned about said tubular core and terminating a distance from an end of said tubular core so that a relatively low bubble point pressure element section is defined; a vent sleeve attached to said precoat support means, said vent sleeve having an aperture covered by a discontinuously slotted sheet means having elongated slots, each slot having a width of up to about 50 microns and a length of at least about one and one-half times the width of the slot.
Claim 14
Dependent Claim
107 words
A filter element adapted to be precoated with a filter medium, comprising: a porous tubular core; means for supporting the filter medium precoat, said precoat support means positioned about said tubular core and terminating a distance from an end of said tubular core so that a relatively low bubble point pressure element section is defined; a vent sleeve attached to said precoat support means, said vent sleeve having an aperture covered by a discontinuously slotted sheet means having elongated slots, each slot having a width of up to about 50 microns and a length of at least about one and one-half times the width of the slot.
Claim 15
Dependent Claim
104 words
In a liquid filtering apparatus including a filter tank, a plate separating said tank into an influent compartment and a filtrate compartment, at least one filter element having a porous tubular core, and precoat means for distributing precoat particles on each filter element, the improvement to each filter element comprising: a discontinuously slotted sheet means positioned about said tubular core for supporting a filter medium, each of said slots having an elongated configuration wherein the width of each slot is up to about 50 microns and the length of each slot is at least about one and one-half times the width of the slot.
Claim 16
Dependent Claim
104 words
In a liquid filtering apparatus including a filter tank, a plate separating said tank into an influent compartment and a filtrate compartment, at least one filter element having a porous tubular core, and precoat means for distributing precoat particles on each filter element, the improvement to each filter element comprising: a discontinuously slotted sheet means positioned about said tubular core for supporting a filter medium, each of said slots having an elongated configuration wherein the width of each slot is up to about 50 microns and the length of each slot is at least about one and one-half times the width of the slot.
Claim 17
Dependent Claim
114 words
In a liquid filtering apparatus including a filter tank, a plate separating said tank into an influent compartment and a filtrate compartment, at least one filter element having a porous tubular core and a coarse screen positioned about said tubular core, and precoat means for distributing a filter medium of finely divided ion exchange resin particles smaller than about 250 microns on each filter element, the improvement to each filter element comprising: a slotted sheet positioned about said coarse screen, said sheet having a plurality of discontinuous slots, each slot having a width up to about 50 microns and a length of at least about one and one-half times the width of the slot.
Claim 18
Dependent Claim
114 words
In a liquid filtering apparatus including a filter tank, a plate separating said tank into an influent compartment and a filtrate compartment, at least one filter element having a porous tubular core and a coarse screen positioned about said tubular core, and precoat means for distributing a filter medium of finely divided ion exchange resin particles smaller than about 250 microns on each filter element, the improvement to each filter element comprising: a slotted sheet positioned about said coarse screen, said sheet having a plurality of discontinuous slots, each slot having a width up to about 50 microns and a length of at least about one and one-half times the width of the slot.
Claim 19
Dependent Claim
153 words
In a liquid filtering apparatus including a filter tank, a plate separating said tank into an influent compartment and a filtrate compartment, at least one filter element vertically mounted in said influent compartment and having a porous tubular ccore, and precoat means for distributing precoat particles on each filter element, the improvement to each filter element comprising: means for supporting the filter medium precoat, said precoat support means positioned about said tubular core and terminating a distance from an end of said tubular core so that a relatively low bubble point pressure element section is defined; and discontinuously slotted sheet means positioned over the relatively low bubble point pressure element section and sealed to said precoat support means, said discontinuously slotted sheet means having elongated slots, each slot having a width of up to about 50 microns and a length of at least about one and one-half times the width of the slot.
Claim 20
Dependent Claim
153 words
In a liquid filtering apparatus including a filter tank, a plate separating said tank into an influent compartment and a filtrate compartment, at least one filter element vertically mounted in said influent compartment and having a porous tubular ccore, and precoat means for distributing precoat particles on each filter element, the improvement to each filter element comprising: means for supporting the filter medium precoat, said precoat support means positioned about said tubular core and terminating a distance from an end of said tubular core so that a relatively low bubble point pressure element section is defined; and discontinuously slotted sheet means positioned over the relatively low bubble point pressure element section and sealed to said precoat support means, said discontinuously slotted sheet means having elongated slots, each slot having a width of up to about 50 microns and a length of at least about one and one-half times the width of the slot.
Claim 21
Dependent Claim
27 words
The filter element of claims 1, 5, 6, 7, 9, 10, 11, or 12 wherein each slot is about 30 microns wide and about 430 microns long.
Claim 22
Dependent Claim
18 words
The filter element of claims 6 or 11 wherein the slotted sheet is bonded to the coarse screen.
Claim 23
Dependent Claim
19 words
The filter element of claims 6 or 11 wherein the slotted sheet is diffusion bonded to the coarse screen.
References Cited (Backward Citations)
US1916393A
Cited
US2267752A
Cited
US2382400A
Cited
FR1069766A
Cited
US3250703A
Cited
US3279608A
Cited
US3177945A
Cited
US3277814A
Cited
US3359192A
Cited
US3520418A
Cited
US3708848A
Cited
US3680700A
Cited
US3715033A
Cited
US3779386A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-05 | 1985-04-06 | 1985-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-05 | 1989-04-06 | 1989-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-05 | 1993-04-06 | 1993-10-06 | $7700.00 | Window Closed / Lapsed |