US4865738A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter cartridge with truncated sawtooth projection assembly
Assignee: 3M Purification Inc
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Filing: 1987-12-03
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Granted: 1989-09-12
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Expires: 2007-12-03
Abstract
Abstract A filter cartridge having an improved end cap and tube support design is taught. Briefly stated, an outer cage has circumferentially disposed thereround a plurality of truncated triangular shaped saw tooth-like projections each of which as a rounded nub or projection at the outermost truncated end. An inner cage similarly has a plurality of alternating projections coextensive therewith, with the thickness of the furthermost portion of the projection being tapered towards the bottom where the projection meets the end of the inner cage. The inner cage is disposed within the outer cage and placed between end caps having circumferential regions adapted to receive the projections disposed at the end of the outer and inner cage respectively. A filtration medium is disposed between the inner and outer cage.
Inventors
- 👤 John J. Black, Jr.
- 👤 Harold A. Lamb, III
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:59
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/111; B01D29/13; B01D2201/00; B01D2201/04; B01D2201/0415; Y; Y10; Y10T; Y10T156/00; Y10T156/17; Y10T156/1702; Y10T156/1744; Y10T156/1798
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
141 words
A filter cartridge, comprising: a filtration medium disposed in a tube opened at at least one end thereof; a support having a substantially closed circumferential configuration disposed in supporting relation to and substantially coextensive with said filtration medium, said support supporting said filtration medium; said support having at least one end opened and formed in a sawtooth-like configuration, having projections, each projection in the form of an upright truncated triangle, and having a circumferential nub along the projection; at least one end cap attached to and extending across the open end of said circumferential configuration, said end cap having at least one portion adapted so as to receive each hub; and end cap melt material extending into and substantially filling the areas disposed between said projections and surroundnng said nub so as to fixedly attach said end cap to said support.
Claim 2
Dependent Claim
141 words
A filter cartridge, comprising: a filtration medium disposed in a tube opened at at least one end thereof; a support having a substantially closed circumferential configuration disposed in supporting relation to and substantially coextensive with said filtration medium, said support supporting said filtration medium; said support having at least one end opened and formed in a sawtooth-like configuration, having projections, each projection in the form of an upright truncated triangle, and having a circumferential nub along the projection; at least one end cap attached to and extending across the open end of said circumferential configuration, said end cap having at least one portion adapted so as to receive each hub; and end cap melt material extending into and substantially filling the areas disposed between said projections and surroundnng said nub so as to fixedly attach said end cap to said support.
Claim 3
Dependent Claim
167 words
A filter cartridge, comprising: a filtration medium disposed in a tube opened at at least one end thereof; a support having a substantially closed circumferential configuration disposed in supporting relation to and substantially coextensive with said filtration medium, said support supporting said filtration medium; said support having at least one end opened and formed in a sawtooth configuration, having projections, each projection in the form of an upright truncated triangle and having a circumferential nub along the projection, each sawtooth having a raised portion and a recessed portion along said circumferential configuration, said recessed portion at least as wide as said raised portion; at least one end cap attached to and extending across the open end of said circumferential configuration, said end cap having at least one portion adapted so as to receive each nub; and end cap melt material extending into and substantially filling the areas disposed between said sawtooth projections and surrounding said hub so as to fixedly attach said end cap to said support.
Claim 4
Dependent Claim
167 words
A filter cartridge, comprising: a filtration medium disposed in a tube opened at at least one end thereof; a support having a substantially closed circumferential configuration disposed in supporting relation to and substantially coextensive with said filtration medium, said support supporting said filtration medium; said support having at least one end opened and formed in a sawtooth configuration, having projections, each projection in the form of an upright truncated triangle and having a circumferential nub along the projection, each sawtooth having a raised portion and a recessed portion along said circumferential configuration, said recessed portion at least as wide as said raised portion; at least one end cap attached to and extending across the open end of said circumferential configuration, said end cap having at least one portion adapted so as to receive each nub; and end cap melt material extending into and substantially filling the areas disposed between said sawtooth projections and surrounding said hub so as to fixedly attach said end cap to said support.
Claim 5
Dependent Claim
163 words
A filter cartridge, comprising: a filtration medium disposed in a tube opened at least one end thereof; inner and outer supports having a substantially closed circumferential configuration disposed in supporting relation to and substantially coextensive with said filtration medium, said inner and outer supports each supporting said filtration medium; said inner and outer supports each having at least one end opened and formed in a sawtooth-like configuration having projections in the form of an upright truncated triangle, each projection having a circumferential nub along the projection; at least one end cap attached to and extending across the open end of said circumferential configuration of said inner and outer supports, said end cap having at least one portion adapted so as to receive each hub of said inner and outer supports; and end cap melt material extending into and substantially filling the areas disposed between said sawtooth projections and surrounding said end cap so as to fixedly attached said end cap to said supports.
Claim 6
Dependent Claim
163 words
A filter cartridge, comprising: a filtration medium disposed in a tube opened at least one end thereof; inner and outer supports having a substantially closed circumferential configuration disposed in supporting relation to and substantially coextensive with said filtration medium, said inner and outer supports each supporting said filtration medium; said inner and outer supports each having at least one end opened and formed in a sawtooth-like configuration having projections in the form of an upright truncated triangle, each projection having a circumferential nub along the projection; at least one end cap attached to and extending across the open end of said circumferential configuration of said inner and outer supports, said end cap having at least one portion adapted so as to receive each hub of said inner and outer supports; and end cap melt material extending into and substantially filling the areas disposed between said sawtooth projections and surrounding said end cap so as to fixedly attached said end cap to said supports.
Claim 7
Dependent Claim
19 words
The filter cartridge of claims 1, 2 or 3 wherein the nub is along the top of each projection.
Claim 8
Dependent Claim
20 words
A filter cartridge assembly according to claims 1, 2 or 3 wherein the nub faces away from the filtration medium.
Claim 9
Dependent Claim
18 words
A filter cartridge according to claims 1, 2 or 3 wherein the nub faces towards the filtration medium.
Claim 10
Dependent Claim
22 words
A filter cartridge according to claims 1, 2 or 3 wherein the nub is adjacent the truncated portion of the upright triangle.
Claim 11
Dependent Claim
21 words
A filter cartridge according to claim 1, 2 or 3 wherein the sawtooth configuration is contiguously disposed around said circumferential opening.
Claim 12
Dependent Claim
32 words
The filter cartridge according to claims 1, 2 or 3 wherein the angle between the truncated portion of said triangle and an adjacent side is in the range of 90° through 150°.
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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) | 1992-09-11 | 1993-03-13 | 1993-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-11 | 1997-03-13 | 1997-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-11 | 2001-03-13 | 2001-09-12 | $7700.00 | Window Closed / Lapsed |