Patent US4611489A successfully refreshed from Google Patents.
US4611489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
U-shaped capacitor level gauge
Assignee: Shell USA Inc
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Filing: 1984-12-24
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Granted: 1986-09-16
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Expires: 2004-12-24
Abstract
Abstract A device for determining the position of an interface between different fluids in a tank or container is provided. This device has a plurality of cells, placed one below another and mounted on a structure which is placed in the tank or container, each cell consisting of three electrically conductive elements, isolated from each other, the first element of each cell being adapted to be connected to an AC signal source, the third element of each cell being adapted to be connected to zero potential, and the second element of each cell being adapted to be connected to a receiver for detecting the transmitted AC signal.
Inventors
- 👤 Klaas Spaargaren
- 👤 Adrianus C. W. Leyen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:51
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/22; G01F23/26; G01F23/263
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
77 words
Apparatus for determining the position of an interface between different fluids, comprising: at least one cell means, said cell means having first, second and third electrically conductive members vertically isolated from and insulatingly disposed adjacent each other with said third member proximate a vertical edge of both said first and second members; signal generating means interconnected with said first member; signal detecting means interconnected with said second member; and zero potential means interconnected with said third member.
Claim 2
Dependent Claim
77 words
Apparatus for determining the position of an interface between different fluids, comprising: at least one cell means, said cell means having first, second and third electrically conductive members vertically isolated from and insulatingly disposed adjacent each other with said third member proximate a vertical edge of both said first and second members; signal generating means interconnected with said first member; signal detecting means interconnected with said second member; and zero potential means interconnected with said third member.
Claim 3
Dependent Claim
15 words
The apparatus of claim 1, wherein said first and second members form a gap therebetween.
Claim 4
Dependent Claim
14 words
The apparatus of claim 1, wherein said members are disposed in a U-shaped form.
Claim 5
Dependent Claim
11 words
The apparatus of claim 1, wherein said members are planar members.
Claim 6
Dependent Claim
88 words
Apparatus for determining the position of an interface between different fluids in a container, comprising: a plurality of cells disposed in a vertical column in said container; wherein each cell consists of first, second and third electrically conductive members vertically isolated from and insulatingly disposed adjacent each other with said third member proximate a vertical edge of both said first and second members; signal generating means interconnected with said first member; signal detecting means interconnected with said second member; and zero potential means interconnected with said third member.
Claim 7
Dependent Claim
88 words
Apparatus for determining the position of an interface between different fluids in a container, comprising: a plurality of cells disposed in a vertical column in said container; wherein each cell consists of first, second and third electrically conductive members vertically isolated from and insulatingly disposed adjacent each other with said third member proximate a vertical edge of both said first and second members; signal generating means interconnected with said first member; signal detecting means interconnected with said second member; and zero potential means interconnected with said third member.
Claim 8
Dependent Claim
20 words
The apparatus of claim 5, wherein each of said first and second members of said cells form a gap therebetween.
Claim 9
Dependent Claim
19 words
The apparatus of claim 5, wherein each of said members of said cells are disposed in a U-shaped form.
Claim 10
Dependent Claim
16 words
The apparatus of claim 5, wherein each of said members of said cells are planar members.
Claim 11
Dependent Claim
22 words
The apparatus of claim 5 further comprising means for deriving information about the position of said interface from the detected AC signals.
Claim 12
Dependent Claim
28 words
The apparatus of claim 9 further comprising switch means adapted to connect each of the said first elements of each cell to the said AC signal generating means.
Claim 13
Dependent Claim
13 words
The apparatus of claim 10, wherein the said switch means are shift registers.
Claim 14
Dependent Claim
30 words
The apparatus of claim 5, wherein each of the said second members of said cells are interconnected to form one long plate extending over the whole length of said apparatus.
Claim 15
Dependent Claim
23 words
The apparatus of claim 5, wherein each of the said third elements of said cells are interconnected to form one long metal bar.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-15 | 1990-03-17 | 1990-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-15 | 1994-03-17 | 1994-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-15 | 1998-03-17 | 1998-09-16 | $7700.00 | Window Closed / Lapsed |