Patent US3722281A successfully refreshed from Google Patents.
US3722281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid height gauge
Assignee: ENG PHYSICS CO
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Filing: 1970-11-04
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Granted: 1973-03-27
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Expires: 1990-11-04
Abstract
Abstract A primary means comprises a coil wrapped around a support member, a secondary means including a coil also wrapped around said support member and adjacent said primary coil. The primary coil is insulated from the liquid and the secondary coil is exposed to the liquid. The secondary means includes a second remote member which is also exposed to the liquid and a voltage is developed between the first and second secondary members. The primary coil is connected with an a.c. source and induces an alternating voltage in the secondary coil. An indicating means indicates the voltage developed between the secondary members which is proportional to the level of liquid in contact with the two secondary members.
Inventors
- 👤 L Marsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:44
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/22; G01F23/26
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
110 words
A liquid height gauge comprising a source of alternating voltage, at least two spaced electrically conductive members for directly physically contacting a liquid the height of which is to be measured, said members comprising secondary means far inductive coupling with said source; primary means including magnetic flux producing means connected to said source for producing an alternating voltage in one member of said secondary means to create an electromotance gradient along the length of said one member; insulating means for insulating said primary means from said secondary means and from the liquid to be measured; and indicating means electrically connected with said members for indicating the height of the liquid.
Claim 2
Dependent Claim
110 words
A liquid height gauge comprising a source of alternating voltage, at least two spaced electrically conductive members for directly physically contacting a liquid the height of which is to be measured, said members comprising secondary means far inductive coupling with said source; primary means including magnetic flux producing means connected to said source for producing an alternating voltage in one member of said secondary means to create an electromotance gradient along the length of said one member; insulating means for insulating said primary means from said secondary means and from the liquid to be measured; and indicating means electrically connected with said members for indicating the height of the liquid.
Claim 3
Dependent Claim
37 words
A gauge as defined in claim 2, wherein said primary means comprises a coil, and a source of alternating current connected with said coil for impressing an alternating current on said coil to produce alternating magnetic flux.
Claim 4
Dependent Claim
31 words
A gauge as defined in claim 3, wherein said coil is disposed adjacent said one secondary member for producing substantially uniform magnetic flux throughout the length of said one secondary member.
Claim 5
Dependent Claim
23 words
A gauge as defined in claim 4, wherein the other of said secondary members is disposed at a position remote from said coil.
Claim 6
Dependent Claim
20 words
A gauge as defined in claim 2, including means for insuring a substantially constant voltage in said one secondary member.
Claim 7
Dependent Claim
53 words
A gauge as defined in claim 6, wherein said means for insuring a substantially constant voltage includes a source of alternating current connected with said primary means, a feed-back circuit being connected with said one secondary member for controlling the alternating current impressed from said source of alternating current on said primary means.
Claim 8
Dependent Claim
29 words
A gauge as defined in claim 2, including support means, said primary means and said secondary means comprising wires wound on said support means and disposed adjacent one another.
Claim 9
Dependent Claim
33 words
A gauge as defined in claim 8, including insulating means retaining said wires in operative position, the outer periphery of the secondary wire being exposed for contact with the liquid to be measured.
Claim 10
Dependent Claim
29 words
A gauge As defined in claim 8, wherein the other of said secondary members is hollow, said hollow secondary member receiving leads connected with the primary and secondary wires.
Claim 11
Dependent Claim
84 words
A gauge as defined in claim 2, wherein said primary means comprises a coil, a source of alternating current connected with said coil for producing alternating magnetic flux in said coil, said coil being disposed adjacent said one secondary member for producing substantially uniform alternating magnetic flux in said one secondary member, and means for insuring a substantially constant voltage in said one secondary member comprising a feed-back circuit connected with said one secondary member for controlling the alternating current impressed on said coil.
Claim 12
Dependent Claim
100 words
A liquid height gauge comprising, in combination: an elongate, vertically extending electrically conductive member for directly physically contacting an electrically conductive liquid whereby a lower end portion length of the member is immersed in such liquid according to the height of the liquid; means for producing a fixed electromotance gradient per unit length of said member whereby to generate current in the electroconductive liquid in which the amplitude of the generated current is linearly proportional to said immersed length of said member; and means electrically connected between said member and the liquid for measuring the amplitude of said generated current.
Claim 13
Dependent Claim
100 words
A liquid height gauge comprising, in combination: an elongate, vertically extending electrically conductive member for directly physically contacting an electrically conductive liquid whereby a lower end portion length of the member is immersed in such liquid according to the height of the liquid; means for producing a fixed electromotance gradient per unit length of said member whereby to generate current in the electroconductive liquid in which the amplitude of the generated current is linearly proportional to said immersed length of said member; and means electrically connected between said member and the liquid for measuring the amplitude of said generated current.
Claim 14
Dependent Claim
45 words
A liquid height gauge as defined in claim 11 wherein the last mentioned means comprises a second elongate, vertically extending conductive member disposed in fixed, spaced and parallel relation to the first mentioned member, and indicating means connected between the upper ends of said members.
Claim 15
Dependent Claim
43 words
A liquid height gauge as defined in claim 12 wherein the first member is a secondary winding and said means for producing comprises a primary winding inductively coupled with said secondary winding and means for impressing an alternating current on said primary winding.
Claim 16
Dependent Claim
42 words
A liquid height gauge as defined in claim 11 wherein said member is a secondary winding, and said means for producing comprises a primary winding inductively coupled with said secondary winding and means for impressing an alternating current on said primary winding.
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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |