Patent US3678748A successfully refreshed from Google Patents.
US3678748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical sensing device for measurement of liquid metal
Assignee: Individual
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Filing: 1970-06-18
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Granted: 1972-07-25
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Expires: 1990-06-18
Abstract
Abstract Sensing device for sensing the level of molten liquid in which four legs of a Wheatstone bridge are wound on two concentric tubes, two opposite legs being spirally wound in pairs along the length of each tube; core material within each two leg windings is ferromagnetic or non-magnetic.
Inventors
- 👤 Jan Dziedzic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:21
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/22; G01F23/26
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
96 words
An electrical sensing device for sensing the level of molten metal in a tank comprising: a supporting tube having a core therein, a core surrounding said tube, and windings on said tube and surrounding core consisting of four legs connected to provide a Wheatstone bridge, first and fourth legs of said windings being opposite legs of said bridge and wound spirally in pairs along the length of said tube, said second and third legs of said windings being wound spirally in pairs along the length of said surrounding core and being opposite legs of said bridge.
Claim 2
Dependent Claim
96 words
An electrical sensing device for sensing the level of molten metal in a tank comprising: a supporting tube having a core therein, a core surrounding said tube, and windings on said tube and surrounding core consisting of four legs connected to provide a Wheatstone bridge, first and fourth legs of said windings being opposite legs of said bridge and wound spirally in pairs along the length of said tube, said second and third legs of said windings being wound spirally in pairs along the length of said surrounding core and being opposite legs of said bridge.
Claim 3
Dependent Claim
11 words
The device of claim 1, said cores being of ferromagnetic material.
Claim 4
Dependent Claim
15 words
The device of claim 1, at least one of the said cores being nonmagnetic material.
Claim 5
Dependent Claim
15 words
The device of claim 3, wherein said one core is said core within said tube.
Claim 6
Dependent Claim
17 words
The device of claim 1, said tube having a longitudinal slit along substantially the entire length thereof.
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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |