Patent US3882891A successfully refreshed from Google Patents.
US3882891A
Expired / Lapsed
US
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Check valve
Assignee: Hagglunds Denison Corp
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Filing: 1974-06-19
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Granted: 1975-05-13
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Expires: 1994-06-19
Abstract
Abstract A check valve for radial ports in a fluid conductor has a resilient partially cylindrical member having a pair of legs biased against a surface on the conductor to close the ports to prevent fluid flow in one direction whereas fluid in the ports moves the legs away from the surface to permit fluid flow through the ports in the opposite direction.
Inventors
- 👤 Alan H Viles
- 👤 Jr Gary C Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:28
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/14; F16K15/144; F16K15/145; F16K15/1402; F16K15/148; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7838; Y10T137/7839; Y10T137/784; Y10T137/7879; Y10T137/7888; Y10T137/789
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
206 words
In a check valve for a cylindrical fluid conductor having a pair of radial ports formed in the fluid conductor; the improvement comprising a resilient partially cylindrical member having a pair of legs joined by a common area and biased against a surface of the conductor to close the ports against fluid flow in one direction but responsive to pressurized fluid in the ports to move away from the fluid conductor to open the ports to enable fluid flow therethrough in the other direction; the resilient member biased against the inner surface of the fluid conductor; means for retaining the resilient member against the inner surface, whereby the pressurized fluid in the ports biases both legs inwardly to open both ports and enable fluid to flow into the fluid conductor; the thickness of each leg increases from the common area to its outer end, each port is tapered such that a larger area is covered by the outer end of a leg and the pressurized fluid in the ports causes the legs to bend mainly at the common area such that the outer ends of the legs will move a greater distance from the inner surface to allow greater fluid flow through the larger port area.
Claim 2
Dependent Claim
206 words
In a check valve for a cylindrical fluid conductor having a pair of radial ports formed in the fluid conductor; the improvement comprising a resilient partially cylindrical member having a pair of legs joined by a common area and biased against a surface of the conductor to close the ports against fluid flow in one direction but responsive to pressurized fluid in the ports to move away from the fluid conductor to open the ports to enable fluid flow therethrough in the other direction; the resilient member biased against the inner surface of the fluid conductor; means for retaining the resilient member against the inner surface, whereby the pressurized fluid in the ports biases both legs inwardly to open both ports and enable fluid to flow into the fluid conductor; the thickness of each leg increases from the common area to its outer end, each port is tapered such that a larger area is covered by the outer end of a leg and the pressurized fluid in the ports causes the legs to bend mainly at the common area such that the outer ends of the legs will move a greater distance from the inner surface to allow greater fluid flow through the larger port area.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |