Patent US3857094A successfully refreshed from Google Patents.
US3857094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical bridge element assembly for corrosion measurement
Assignee: Dow Chemical Co
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Filing: 1974-01-02
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Granted: 1974-12-24
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Expires: 1994-01-02
Abstract
Abstract The invention comprises an electrical bridge element assembly wherein a thin metal strip is folded together to provide two arms of the bridge, one arm of which is split along at least a substantial part of its length. The arms are spaced apart from each other except at their common folded end by electrically insulation means which is bonded to the adjacent surfaces of each arm. The element is encased in housing wherein only one surface of the unsplit arm is exposed to be corroded. Electrical leads are coupled to the ends of the arm parts whereby the element may function as two resistance arms of an electrical bridge circuit.
Inventors
- 👤 V Caldecourt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:26
CPC Classifications
G; G01; G01N; G01N17/00; G01R; G01R27/00; G01R27/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
120 words
An electrical bridge member assembly for use in making measurements of corrosivity of a fluid, comprising a thin strip having at least one metal surface, said strip being folded back on itself to form two arm parts, one arm being split along at least a substantial part of its length, said arms being spaced apart and bonded to electrically insulating heat transfer means which is in layer-like form, said heat transfer means extending from adjacent to the common end of said arms to at least the other end of one of said arms, means for electrically coupling said asSembly to external bridge measurement apparatus, and means for shielding all but one surface of one of said arms from said fluid.
Claim 2
Dependent Claim
120 words
An electrical bridge member assembly for use in making measurements of corrosivity of a fluid, comprising a thin strip having at least one metal surface, said strip being folded back on itself to form two arm parts, one arm being split along at least a substantial part of its length, said arms being spaced apart and bonded to electrically insulating heat transfer means which is in layer-like form, said heat transfer means extending from adjacent to the common end of said arms to at least the other end of one of said arms, means for electrically coupling said asSembly to external bridge measurement apparatus, and means for shielding all but one surface of one of said arms from said fluid.
Claim 3
Dependent Claim
16 words
An assembly in accordance with claim 1, wherein said heat transfer means comprises an organic resin.
Claim 4
Dependent Claim
19 words
An assembly in accordance with claim 1, wherein a surface of said unsplit arm is exposed to said fluid.
Claim 5
Dependent Claim
35 words
An assembly in accordance with claim 1, wherein said shielding comprises a box-like member wherein said one surface of one of said arms is positioned as a part of the top of said box-like member.
Claim 6
Dependent Claim
21 words
An assembly in accordance with claim 1, wherein said heat transfer means includes a layer of porous sheet-like electrically insulating material.
Claim 7
Dependent Claim
18 words
An assembly in accordance with claim 1, wherein said strip is between one and 10 mils in thickness.
Claim 8
Dependent Claim
16 words
An assembly in accordance with claim 1, wherein said heat transfer means is an epoxy resin.
Claim 9
Dependent Claim
23 words
An assembly in accordance with claim 1, wherein said heat transfer means is from one to six times the thickness of said strip.
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) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |