US4304580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air cleaner with suspended cartridge
Assignee: Donaldson Co Inc
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Filing: 1980-08-04
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Granted: 1981-12-08
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Expires: 2000-08-04
Abstract
Abstract An air cleaner which includes a support (23) having a first concave conical surface (26) and compression means (50) extending along the axis of said surface away from the apex of said surface; an hollow inner filter (37) including a first end cap (41) with a rim (43) defining a first convex conical surface having the same apex angle as said first concave surface, and a second end cap (42) for axial engagement by said compression means; and a hollow, outer filter (32) including an end cap (57) with a resilient lip (61) extending inwardly to be sealingly received between said conical surfaces when said compression means engages said second end cap. The second end cap of the inner filter may have a second convex conical surface (47), and the outer filter may have a second end cap with a resilient lip extending to be sealingly engaged by the second convex conical surface.
Inventors
- 👤 Warren G. Gehl
- 👤 Mervin E. Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:11
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/0002; B01D46/0004; B01D46/0084; B01D46/0095; B01D46/24; B01D46/2403; B01D46/2411; B01D46/2414; B01D46/52; B01D46/521; B01D46/56; B01D46/62; B01D46/64
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
157 words
An air cleaner comprising, in combination: a support having a first concave conical surface, compression means extending along the longitudinal axis of said surface away from the apex of said surface and outlet means for releasing filtered air from said cleaner; a hollow inner filter surrounding the longitudinal axis of said support, said inner filter including a first end cap, with a rim defining a first convex conical surface having the same apex angle as said first concave surface and positioned adjacent said first concave surface, and a second end cap which is in axial engagement by said compression means; and a hollow outer filter positioned substantially around said inner filter, said outer filter including a first end cap with a resilient lip extending inwardly so as to be sealingly received between said conical surfaces due to said compression means engaging said second end cap and air inlet means for introducing unfiltered air flow into said cleaner.
Claim 2
Dependent Claim
157 words
An air cleaner comprising, in combination: a support having a first concave conical surface, compression means extending along the longitudinal axis of said surface away from the apex of said surface and outlet means for releasing filtered air from said cleaner; a hollow inner filter surrounding the longitudinal axis of said support, said inner filter including a first end cap, with a rim defining a first convex conical surface having the same apex angle as said first concave surface and positioned adjacent said first concave surface, and a second end cap which is in axial engagement by said compression means; and a hollow outer filter positioned substantially around said inner filter, said outer filter including a first end cap with a resilient lip extending inwardly so as to be sealingly received between said conical surfaces due to said compression means engaging said second end cap and air inlet means for introducing unfiltered air flow into said cleaner.
Claim 3
Dependent Claim
37 words
An air cleaner according to claim 1 in which said inner filter is constructed and arranged to resist compression forces along said axis, and said outer filter is constructed and arranged to be effected by compression forces.
Claim 4
Dependent Claim
87 words
An air cleaner according to claim 1 in which said second end cap of said inner filter includes a second rim defining a second convex conical surface spaced axially from said first conical surface, and said outer filter includes a second end cap with a second resilient lip extending inwardly and sealingly engaged by said second convex conical surface, the axial distance between said lips being substantially the same as the axial spacing of said rims, whereby respective adjacent lip and rim surfaces resiliently engage each other.
Claim 5
Dependent Claim
25 words
An air cleaner according to claim 3 in which the apices of all of said conical surfaces lie in the same direction along said axis.
Claim 6
Dependent Claim
34 words
An air cleaner according to claim 3 in which said second lip of said outer filter is dimensioned and constructed to resiliently enable passage of said first end cap of said inner filter therethrough.
Claim 7
Dependent Claim
44 words
An air cleaner according to claim 5 in which said first end cap of said inner filter is designed and constructed to facilitate axial movement of said cap past the first named resilient lip of said outer filter in reverse directions along said axis.
References Cited (Backward Citations)
US3724179A
Cited
US4007026A
Cited
US4135899A
Cited
DE2840628A1
Cited
US4159197A
Cited
US4211543A
Cited
US4151095A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-07 | 1985-06-08 | 1985-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-07 | 1989-06-08 | 1989-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-07 | 1993-06-08 | 1993-12-08 | $7700.00 | Window Closed / Lapsed |