Patent US4175671A successfully refreshed from Google Patents.
US4175671A
Expired / Lapsed
US
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Breather cap
Assignee: Caterpillar Inc
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Filing: 1978-05-01
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Granted: 1979-11-27
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Expires: 1998-05-01
Abstract
Abstract A breather cap has a resilient element which is expanded radially by the movement of first and second plates toward one another. Air can pass through the breather cap and is filtered by a filter device provided in the breather cap.
Inventors
- 👤 Harold H. Holl
- 👤 Walter R. Hupe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:55
CPC Classifications
F; F16; F16H; F16H57/00; F16H57/02; F16H57/027; F16K; F16K7/00; F16K7/20
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
176 words
In a breather cap having first and second plates positioned at opposite ends of a resilient cylindrical element and means for selectively moving the plates toward one another and radially expanding the resilient element, the improvement comprising: first means for passing air through the breather cap, said first means including a bore extending longitudinally through said resilient element, an orifice extending through said second plate and in communication with said bore, a disc positioned between said first plate and said resilient element, said disc having a central opening in communication with the bore of said resilient element and a groove in the disc connecting the central opening with ambient; second means for filtering the air passing through the first means; and wherein said resilient element has a flange extending radially outwardly at the end adjacent the first plate, said first plate having a lip extending longitudinally toward said second plate encircling the flange of the resilient element and spaced therefrom a predetermined distance forming an annular opening, said groove being in communication with said annular opening.
Claim 2
Dependent Claim
176 words
In a breather cap having first and second plates positioned at opposite ends of a resilient cylindrical element and means for selectively moving the plates toward one another and radially expanding the resilient element, the improvement comprising: first means for passing air through the breather cap, said first means including a bore extending longitudinally through said resilient element, an orifice extending through said second plate and in communication with said bore, a disc positioned between said first plate and said resilient element, said disc having a central opening in communication with the bore of said resilient element and a groove in the disc connecting the central opening with ambient; second means for filtering the air passing through the first means; and wherein said resilient element has a flange extending radially outwardly at the end adjacent the first plate, said first plate having a lip extending longitudinally toward said second plate encircling the flange of the resilient element and spaced therefrom a predetermined distance forming an annular opening, said groove being in communication with said annular opening.
Claim 3
Dependent Claim
28 words
The breather cap of claim 1 wherein said groove in said disc is an indented portion of said disc, said indented portion being imbedded within said resilient element.
References Cited (Backward Citations)
US3255743A
Cited
US3295712A
Cited
US3326404A
Cited
US3420274A
Cited
US3891114A
Cited
US3901167A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-11-26 | 1983-05-28 | 1983-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-26 | 1987-05-28 | 1987-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-26 | 1991-05-28 | 1991-11-27 | $7700.00 | Window Closed / Lapsed |