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US3609549A
Expired / Lapsed
US
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Corrosion-measuring device
Assignee: Universal Oil Products Co
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Filing: 1970-06-15
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Granted: 1971-09-28
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Expires: 1990-06-15
Abstract
Abstract This invention relates to an improved corrosion-measuring device in which at least a portion of a temperature sensitive voltage output means is located proximate to a corrosion test specimen. The corrosion test specimen is located in a circuit having a stable and normally constant input voltage. The extent of corrosion is determined by the decrease in current resulting from the increase in resistance of the test specimen as it corrodes over a period of time. The temperature sensitive voltage output means is at the same temperature as the test specimen and adjusts the input voltage to negate the effects of varying temperature on the current flowing through the test specimen.
Inventors
- 👤 Rudolf H Hausler
- 👤 Robert W Sampson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:41
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/041; G01N17/00; G01N17/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
17 words
The resistance-probe corrosion-measuring device of claim 1 further characterized in that said current source is a potentiostat.
Claim 2
Dependent Claim
252 words
A temperature compensated corrosion-measuring device comprising: a. an electric circuit having a control terminal; b. an adjustable current source connected in said circuit and having an output connected to said control terminal and having a return input terminal connected in said circuit and having an error voltage input terminal; c. an electrically conductive corrosion test specimen having first and second ends and connected in said electric circuit with said first end connected to said control terminal; d. A current-sensing means connected in said electric circuit in series with said test specimen; e. A first differential input operational amplifier having an output connected to said error voltage input terminal of said adjustable current source having a first input terminal connected to said first end of said test specimen and having a second input terminal; f. a second differential input operational amplifier having an output connected to said second input terminal of said first differential input operational amplifier and having first and second input terminals; g. a voltage output means having a tEmperature sensitive portion proximately located with respect to said test specimen and having an output terminal; h. a single input operational amplifier having an input terminal connected to said output terminal of said voltage output means and having an output connected to said first input terminal of said second differential input operational amplifier; and, i. a reference voltage source connected to said second end of said test specimen and connected to said second input terminal of said second differential input operational amplifier.
Claim 3
Dependent Claim
98 words
The combination comprising a resistance-probe corrosion-measuring device having a stable, adjustable current source, an electrically conductive corrosion test specimen, and a current-sensing means connected in series, and a temperature sensitive voltage output means proximately located with respect to said test specimen and connected to said adjustable current source, whereby said current source is adjusted to compensate for temperature changes at said test specimen, and a linear polarization corrosion-measuring instrument having electrodes, and switches connecting said adjustable current source and said current-sensing means in series alternatively with said test specimen and with said electrodes of said linear polarization cell.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |