Patent US3935740A successfully refreshed from Google Patents.
US3935740A
Expired / Lapsed
US
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Liquid level probe
Assignee: Pfaudler Inc
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Filing: 1974-06-20
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Granted: 1976-02-03
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Expires: 1994-06-20
Abstract
Abstract A capacitive probe for gauging the level of liquid within a reaction tank, or the like, in which the capacitive probe is formed by an electrode strip affixed to a pre-existing elongated member which projects into the reactor tank, wherein the tank and the strip define two electrodes of a capacitor.
Inventors
- 👤 John Butler Whitney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:46
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/22; G01F23/26; G01F23/263; G01F23/268
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
123 words
A liquid level capacitor probe for a reactor tank having an elongated member having a glass coating and projecting vertically from the top of said tank into said tank and extending a substantial portion of the height of said tank, said liquid level capacitor probe comprising: insulating means including said glass coating on said member for electrically insulating and protecting at least a portion of the surface of said member; and a strip electrode extending in the elongated dimension of said member and attached to said glass coating and surrounded by another glass coating, said strip electrode thereby forming a capacitor with said reactor tank, the magnitude of which is dependent upon the dielectric constant media between said electrode and said reactor tank.
Claim 2
Dependent Claim
123 words
A liquid level capacitor probe for a reactor tank having an elongated member having a glass coating and projecting vertically from the top of said tank into said tank and extending a substantial portion of the height of said tank, said liquid level capacitor probe comprising: insulating means including said glass coating on said member for electrically insulating and protecting at least a portion of the surface of said member; and a strip electrode extending in the elongated dimension of said member and attached to said glass coating and surrounded by another glass coating, said strip electrode thereby forming a capacitor with said reactor tank, the magnitude of which is dependent upon the dielectric constant media between said electrode and said reactor tank.
Claim 3
Dependent Claim
17 words
A liquid level capacitor probe as defined in claim 1 wherein said elongated member is a baffle.
Claim 4
Dependent Claim
22 words
A liquid level capacitor probe as defined in claim 1 wherein said strip electrode is formed by a length of conductive ribbon.
References Cited (Backward Citations)
US2677964A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-02 | 1979-08-04 | 1980-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-02 | 1983-08-04 | 1984-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-02 | 1987-08-04 | 1988-02-03 | $7700.00 | Window Closed / Lapsed |