Patent US3712136A successfully refreshed from Google Patents.
US3712136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for the determination of liquid levels
Assignee: Navalco
•
Filing: 1970-09-22
•
Granted: 1973-01-23
•
Expires: 1990-09-22
Abstract
Abstract A fluidic level sensor in which a stream of energy fluid is alternatively diverted between two discharge channels by a control channel. One of the discharge channels is connected to an indicator, and the control channel is connected to a hollow probe which is adapted to have its free end closed by the surface of the fluid material being sensed. A branch channel is provided between the supply line of the fluid of the device and the control channel to permit the use of the supplied energy fluid to divert the stream into a selected discharge channel, the line is controlled by a pair of valves having a small hole therebetween opening to the atmosphere.
Inventors
- 👤 P Monsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:20
CPC Classifications
F; F15; F15C; F15C1/00; F15C1/005; G; G01; G01F; G01F23/00; G01F23/14; G01F23/16; G01F23/161; Y; Y10; Y10T; Y10T137/00; Y10T137/206; Y10T137/2065
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
188 words
An arrangement for the determination of the level of the surface of a free flowing material comprising a hollow probe having a free end adapted to be closed by said surface, a fluidistor onto which the pneumatic probe is connected, and an indicating device, which fluidistor changes its state when the free end of the probe is closed and a pressure change occurs in the probe, and which indicating device is activated by the said change of state in the fluidistor, characterized in that the fluidistor includes a conduit for connection with an energy stream from a separate source, two energy stream discharge channels to one of which the indicating device is connected, a control channel to which the probe is connected for selectively controlling the flow alternatively into said two discharge channels, a direct channel arranged between the conduit and the control channel and at least two valves spaced apart in said direct channel for controlling the admission of the energy stream into said control channel, and a small hole intermediate said valves to provide a passage for ambient air into said direct channel between said valves.
Claim 2
Dependent Claim
188 words
An arrangement for the determination of the level of the surface of a free flowing material comprising a hollow probe having a free end adapted to be closed by said surface, a fluidistor onto which the pneumatic probe is connected, and an indicating device, which fluidistor changes its state when the free end of the probe is closed and a pressure change occurs in the probe, and which indicating device is activated by the said change of state in the fluidistor, characterized in that the fluidistor includes a conduit for connection with an energy stream from a separate source, two energy stream discharge channels to one of which the indicating device is connected, a control channel to which the probe is connected for selectively controlling the flow alternatively into said two discharge channels, a direct channel arranged between the conduit and the control channel and at least two valves spaced apart in said direct channel for controlling the admission of the energy stream into said control channel, and a small hole intermediate said valves to provide a passage for ambient air into said direct channel between said valves.
Claim 3
Dependent Claim
43 words
An arrangement according to claim 1, characterized in that the fluidistor comprises a bistable fluidistor having a second control channel and a reduction valve connected in said second control channel, at least one of said direct channel valves being also a reduction valve.
Claim 4
Dependent Claim
38 words
An arrangement according to claim 1 in which said control channel comprises a hose or tube, characterized in that the probe is constituted by a metallic sleeve having greater diameter than the diameter of the hose or tube.
References Cited (Backward Citations)
US494467A
Cited
US1116328A
Cited
US1289755A
Cited
US2865320A
Cited
US3277914A
Cited
US3578010A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |