US4410427A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid filtering device
Assignee: Donaldson Co Inc
•
Filing: 1981-11-02
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Granted: 1983-10-18
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Expires: 2001-11-02
Abstract
Abstract A fluid filtering device in various embodiments is disclosed. The filter includes, in one embodiment, alternating layers (34, 36) of flat and corrugated filter media which are rolled together and sealed at alternate ends by sealant (38, 42). Further embodiments disclose filter packs (112, 212, 312) of alternating layers of flat and corrugated filter media. In one embodiment, corrugations of successive layers are aligned in parallel. In an alternate embodiment corrugations are aligned orthogonally. Unfiltered fluids enter tubular passages (44) for example, and must exit by adjacent passages either above, below or beside the flute of entry to exit the filter. Filtering occurs when the fluid crosses a sidewall of filter media.
Inventors
- 👤 Robert M. Wydeven
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:14
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/52; B01D46/521; B01D46/525; B01D46/527; B01D25/00; B01D25/22; B01D25/24; B01D25/26; B01D46/0039; B01D46/005; B01D46/10; B01D46/12; B01D46/526; B01D2275/00; B01D2275/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
183 words
A fluid filter having four sides comprising: (a) a pair of fluid impervious members in a spaced relationship forming a top and bottom barier; (b) a filter element to be bounded on its upper and lower faces to said barrier elements, said element including a filter pack having: a first layer of corrugated filter media having a surface of longitudinal peaks and valleys, a second layer atop said first layer, said second layer being of substantially flat filter media, a third layer atop said second layer, said third layer being of corrugated filter media having a surface of longitudinal peaks and valleys which are oriented orthogonally to the corrugations in said first layer, sealant means for preventing entry or exit or fluid therethrough, applied to said first layer on peripheral edges thereof which are parallel to the axis defined by the longitudinal corrugations of said first layer, sealant means for preventing the entry or exit of fluid therethrough applied to said third layer on the peripheral edges thereof which are parallel to the axis defined by the longitudinal corrugations of said third layer.
Claim 2
Dependent Claim
183 words
A fluid filter having four sides comprising: (a) a pair of fluid impervious members in a spaced relationship forming a top and bottom barier; (b) a filter element to be bounded on its upper and lower faces to said barrier elements, said element including a filter pack having: a first layer of corrugated filter media having a surface of longitudinal peaks and valleys, a second layer atop said first layer, said second layer being of substantially flat filter media, a third layer atop said second layer, said third layer being of corrugated filter media having a surface of longitudinal peaks and valleys which are oriented orthogonally to the corrugations in said first layer, sealant means for preventing entry or exit or fluid therethrough, applied to said first layer on peripheral edges thereof which are parallel to the axis defined by the longitudinal corrugations of said first layer, sealant means for preventing the entry or exit of fluid therethrough applied to said third layer on the peripheral edges thereof which are parallel to the axis defined by the longitudinal corrugations of said third layer.
Claim 3
Dependent Claim
48 words
The filter according to claim 1 wherein said filter pack has four sidewalls and including barrier means for blocking passage of fluids applied to two adjacent sidewalls of said fluid pack so that only two remaining sides will allow passage of fluids into and out of said filter.
Claim 4
Dependent Claim
15 words
The filter according to claim 2 wherein said barrier means includes a fluid impervious coating.
Claim 5
Dependent Claim
18 words
The filter of claim 2 wherein said barrier means includes planar members affixed to said two adjacent sidewalls.
Claim 6
Dependent Claim
57 words
The filter of claim 1 or 4 wherein said fluid impervious members extend beyond said filter pack, and including at least one divider member having one edge in abutment with the intersection of adjacent sidewalls, said divider members being between and in contact with said fluid impervious members, thereby dividing inlet and outlet sides of said filter.
Claim 7
Dependent Claim
28 words
The filter of claim 5 wherein said divider wall is oriented at about 135 degrees relative to each of said adjacent sides in which it is in abutment.
Claim 8
Dependent Claim
21 words
The filter of claim 1 wherein said sealant means includes a fluid impervious coating which is applied to said filter element.
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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) | 1986-10-17 | 1987-04-18 | 1987-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-17 | 1991-04-18 | 1991-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-17 | 1995-04-18 | 1995-10-18 | $7700.00 | Window Closed / Lapsed |