US4494575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gravity dump valve
Assignee: Coopers Filters Ltd
•
Filing: 1983-02-01
•
Granted: 1985-01-22
•
Expires: 2003-02-01
Abstract
Abstract A rubber or elastomer gravity dump valve for an air cleaner is provided with an internal bracing strut to control the compliance of the valve discharge lips. The strut extends across the valve at or adjacent to the point of lip initiation.
Inventors
- 👤 Robert S. Gladstone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:45
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/14; F16K15/144; F16K15/147; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7879; Y10T137/788; Y10T137/7882
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
76 words
A gravity dump valve for an air cleaner comprising an unreinforced, tubular elastomeric body having an inlet and and outlet spaced apart from the inlet, the outlet being in the form of a tapered body portion terminating in discharge lips which are normally closed and a rigid bracing strut extending across the inside of the valve in the tubular body at or adjacent the region where the tubular elastomeric body commences to taper towards the lips.
Claim 2
Dependent Claim
76 words
A gravity dump valve for an air cleaner comprising an unreinforced, tubular elastomeric body having an inlet and and outlet spaced apart from the inlet, the outlet being in the form of a tapered body portion terminating in discharge lips which are normally closed and a rigid bracing strut extending across the inside of the valve in the tubular body at or adjacent the region where the tubular elastomeric body commences to taper towards the lips.
Claim 3
Dependent Claim
31 words
A gravity dump valve according to claim 1, wherein the strut extends across the inside of the valve in a direction substantially normal to the line of contact between the lips.
References Cited (Backward Citations)
US2328382A
Cited
US2371449A
Cited
US2598002A
Cited
US2642259A
Cited
GB971851A
Cited
DE1407919A1
Cited
US3586040A
Cited
US3595266A
Cited
US3901272A
Cited
US3898701A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-22 | 1988-07-23 | 1989-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-22 | 1992-07-23 | 1993-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-22 | 1996-07-23 | 1997-01-22 | $7700.00 | Window Closed / Lapsed |