US4262252A
Expired / Lapsed
US
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Measuring electrode for sulfuric acid concentration
Assignee: Panclor SA
•
Filing: 1978-05-22
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Granted: 1981-04-14
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Expires: 1998-05-22
Abstract
Abstract A measuring electrode for determining the concentration of aqueous sulfuric acid solutions comprising a lead electrode activated by anodic polarization in aqueous sulfuric acid and a process of determining the state of charge of a lead-acid battery.
Inventors
- 👤 Placido M. Spaziante
- 👤 Luigi Giuffre
- 👤 Giovanni Modica
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:24
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/42; H01M10/48; H01M10/484; G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/4035; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
65 words
A measuring apparatus comprising a measuring electrode sensitive to HSO 4 - ion concentrations consisting essentially of a body with at least an outer lead surface preactivated by anodic polarization in aqueous sulfuric acid electrically connected to a reference electrode for sulfuric acid for immersion of both in a lead-acid battery and means for determining the potential between the electrodes to ascertain the acid concentration.
Claim 2
Dependent Claim
65 words
A measuring apparatus comprising a measuring electrode sensitive to HSO 4 - ion concentrations consisting essentially of a body with at least an outer lead surface preactivated by anodic polarization in aqueous sulfuric acid electrically connected to a reference electrode for sulfuric acid for immersion of both in a lead-acid battery and means for determining the potential between the electrodes to ascertain the acid concentration.
Claim 3
Dependent Claim
54 words
A process for preparing a measuring electrode sensitive to HSO 4 - ion concentrations to determine the charge of a lead-acid battery comprising subjecting an electrode with at least the outer surface being lead to anodic polarization with a counter-electrode in aqueous sulfuric acid until it is sensitive to HSO 4 - ion concentrations.
Claim 4
Dependent Claim
54 words
A process for preparing a measuring electrode sensitive to HSO 4 - ion concentrations to determine the charge of a lead-acid battery comprising subjecting an electrode with at least the outer surface being lead to anodic polarization with a counter-electrode in aqueous sulfuric acid until it is sensitive to HSO 4 - ion concentrations.
Claim 5
Dependent Claim
25 words
The process of claim 2 wherein the concentration of the sulfuric acid is 10 to 30% and the polarization time is 30 to 60 minutes.
Claim 6
Dependent Claim
31 words
The process of claim 2 wherein the polarization is effected in the electrolyte of the battery whose charge is to be determined and the polarization voltage is supplied by the battery.
Claim 7
Dependent Claim
19 words
The method of claim 4 wherein the measuring electrode is reactivated every 24 hours with a 30 second polarization.
Claim 8
Dependent Claim
39 words
A method of determining the degree of charge of a lead-acid battery comprising immersing in the electrolyte of a lead-acid battery the electrodes of the apparatus of claim 1 and determining the potential of the thus formed galvanic cell.
Claim 9
Dependent Claim
28 words
The method of claim 6 wherein the electrodes are kept in the battery electrolyte and the measuring electrode is reactivated every 24 hours with a 30 second polarization.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-04-13 | 1984-10-13 | 1985-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-13 | 1988-10-13 | 1989-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-13 | 1992-10-13 | 1993-04-14 | $7700.00 | Window Closed / Lapsed |