US4072594A
Expired / Lapsed
US
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Anodic stripping voltammetric apparatus
Assignee: Mitsubishi Chemical Corp
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Filing: 1976-05-03
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Granted: 1978-02-07
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Expires: 1996-05-03
Abstract
Abstract In anodic stripping voltametric apparatus the time constant of the filter circuit of the voltage holder is selected to be of from 0.01 to 0.1 second for the purpose of analyzing an extremely small quantity of metal ions at high accuracies.
Inventors
- 👤 Koremitsu Outsuka
- 👤 Yutaka Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:51
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/416; G01N27/42; G01N27/48
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
115 words
Differential pulse anodic stripping voltammetry apparatus comprising: an electrolytic cell having a working electrode and a counter electrode; a source of plating voltage, a source of sweeping stripping voltage and a source of pulse voltage for impressing plating voltage, stripping voltage and pulse voltage respectively across the working electrode and the counter electrode; a current-voltage converter for converting the current flowing through the working electrode into voltage for producing two sample voltages; two voltage holding means each having a filter circuit with a time constant of 0.01 to 0.1 second for holding the two sample voltages; and a differential amplifier for amplifying the difference between the two sample voltages held by the voltage holding means.
Claim 2
Dependent Claim
115 words
Differential pulse anodic stripping voltammetry apparatus comprising: an electrolytic cell having a working electrode and a counter electrode; a source of plating voltage, a source of sweeping stripping voltage and a source of pulse voltage for impressing plating voltage, stripping voltage and pulse voltage respectively across the working electrode and the counter electrode; a current-voltage converter for converting the current flowing through the working electrode into voltage for producing two sample voltages; two voltage holding means each having a filter circuit with a time constant of 0.01 to 0.1 second for holding the two sample voltages; and a differential amplifier for amplifying the difference between the two sample voltages held by the voltage holding means.
Claim 3
Dependent Claim
19 words
The apparatus according to claim 1 wherein the time constant of the filter circuit is 0.01 to 0.08 second.
Claim 4
Dependent Claim
19 words
The apparatus according to claim 1 wherein the time constant of the filter circuit is 0.01 to 0.05 second.
Claim 5
Dependent Claim
23 words
The apparatus according to claim 1 which further comprises means for discharging voltage held by the voltage holding means after completion of measurement.
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) | 1981-02-06 | 1981-08-08 | 1982-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-06 | 1985-08-08 | 1986-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-06 | 1989-08-08 | 1990-02-07 | $7700.00 | Window Closed / Lapsed |