US3854087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Kelvin bridge type corrosion measuring probe
Assignee: EIDP Inc
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Filing: 1973-11-06
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Granted: 1974-12-10
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Expires: 1993-11-06
Abstract
Abstract Disclosed herein is a Kelvin double bridge type corrosion measuring probe comprising inter alia an enclosing metal shell, at least a portion of which is specimen metal; a temperaturecompensating body of specimen metal located inside the shell; a metal closure at the probe tip serving as the bridge yoke, and additional bridge resistances located usually within the probe and outside of the environment of the corrosive medium.
Inventors
- 👤 J Frenck
- 👤 E Poole
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:33
CPC Classifications
G; G01; G01R; G01R17/00; G01R17/10; G01R17/105; G01N; G01N17/00; G01R27/00; G01R27/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
188 words
A Kelvin double bridge type probe for measuring corrosion On specimen metal in a corrosive medium, the probe characterized in having, electrically interconnected, elements of i. an enclosing shell, at least part of which is the specimen metal element of the bridge, one end of the shell being conductively connected to the specimen metal and to ii. a reference body of specimen metal that is inside the shell and thereby protected from contact with the corrosive medium, the reference body being at least partially surrounded by the shell, in thermal proximity to the shell, and electrically insulated therefrom except for bridge connections, and iii. two pairs of bridge resistances having electrical contact with a source of electricity, and connecting the specimen metal to the reference body, each resistance of each pair being connected to the other of the pair at one end with the other end connected to the specimen metal or the reference specimen, each pair of resistances having a junction between each resistance of the pair, each junction linked to output leads that provide a bridge signal as a function of corrosion of the specimen metal.
Claim 2
Dependent Claim
188 words
A Kelvin double bridge type probe for measuring corrosion On specimen metal in a corrosive medium, the probe characterized in having, electrically interconnected, elements of i. an enclosing shell, at least part of which is the specimen metal element of the bridge, one end of the shell being conductively connected to the specimen metal and to ii. a reference body of specimen metal that is inside the shell and thereby protected from contact with the corrosive medium, the reference body being at least partially surrounded by the shell, in thermal proximity to the shell, and electrically insulated therefrom except for bridge connections, and iii. two pairs of bridge resistances having electrical contact with a source of electricity, and connecting the specimen metal to the reference body, each resistance of each pair being connected to the other of the pair at one end with the other end connected to the specimen metal or the reference specimen, each pair of resistances having a junction between each resistance of the pair, each junction linked to output leads that provide a bridge signal as a function of corrosion of the specimen metal.
Claim 3
Dependent Claim
20 words
A probe according to claim 1 wherein the thickness of the enclosing shell is from about 10 to 30 mils.
Claim 4
Dependent Claim
21 words
A probe according to claim 2 wherein the thickness of the enclosing shell is less than 10% of the shell diameter.
Claim 5
Dependent Claim
30 words
A probe according to claim 1 wherein a pair of bridge resistances are electrically connected to the specimen metal element of the enclosing shell at positions of increased shell thickness.
Claim 6
Dependent Claim
19 words
A probe according to claim 1 containing thermally conductive potting compound between the reference body and the enclosing shell.
Claim 7
Dependent Claim
25 words
A probe according to claim 1 wherein at least 30% of the reference body is surrounded by the specimen metal element of the enclosing shell.
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) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |