US3575533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid level sensing device
Assignee: Caterpillar Inc
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Filing: 1969-03-20
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Granted: 1971-04-20
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Expires: 1989-03-20
Abstract
Abstract A liquid level sensing device wherein, when the liquid level drops below a predetermined amount, fluid at high velocity exerts a force against one end of a valve spool, causing movement of the spool against a biasing force. When the liquid level rises above the predetermined amount, the high velocity fluid is dissipated within the liquid by friction.
Inventors
- 👤 Thomas J Bubula
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:28
CPC Classifications
F; F16; F16N; F16N19/00; F16N19/006; F04; F04F; F04F5/00; F04F5/44; F04F5/48; G; G05; G05D; G05D9/00; G05D9/04; Y; Y10; Y10T; Y10T137/00; Y10T137/7287; Y10T137/7313
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
174 words
In a liquid scavenging system, means providing liquid to an apparatus, means providing fluid to a jet pump, means providing fluid to a valve within the apparatus, means connecting the valve to the jet pump for passage of liquid from the apparatus to the jet pump, spool means in said valve, means on one end of the spool means biasing said spool means to open the connecting means in the valve for converting the fluid provided thereto into a jet spray, said means for converting the fluid being so positioned as to direct the jet spray onto the other end of said spool, means in the valve allowing dissipation of the jet spray before it can impinge upon the spool means when the liquid in the apparatus exceeds a predetermined level, whereby said spool means is actuated to a position clOsing the connecting means until the liquid level in the apparatus rises to a point where it dissipates the jet stream whereupon the biasing means actuates the spool means to open the connecting means.
Claim 2
Dependent Claim
174 words
In a liquid scavenging system, means providing liquid to an apparatus, means providing fluid to a jet pump, means providing fluid to a valve within the apparatus, means connecting the valve to the jet pump for passage of liquid from the apparatus to the jet pump, spool means in said valve, means on one end of the spool means biasing said spool means to open the connecting means in the valve for converting the fluid provided thereto into a jet spray, said means for converting the fluid being so positioned as to direct the jet spray onto the other end of said spool, means in the valve allowing dissipation of the jet spray before it can impinge upon the spool means when the liquid in the apparatus exceeds a predetermined level, whereby said spool means is actuated to a position clOsing the connecting means until the liquid level in the apparatus rises to a point where it dissipates the jet stream whereupon the biasing means actuates the spool means to open the connecting means.
Claim 3
Dependent Claim
27 words
The scavenging system of claim 1 wherein the means in the valve for converting the fluid into a jet spray comprises a pair of axially aligned orifices.
Claim 4
Dependent Claim
26 words
The scavenging system of claim 2 wherein the means allowing dissipation of the jet spray comprise a space between the orifices into which liquid can enter.
Claim 5
Dependent Claim
16 words
The scavenging system of claim 3 wherein the axial alignment of the orifices is substantially horizontal.
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) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |