US3970476A
Expired / Lapsed
US
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Electrochemical cell containing corrosion inhibitor
Assignee: Compagnie Industrielle des Piles Electriques CIPEL SA
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Filing: 1975-06-26
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Granted: 1976-07-20
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Expires: 1995-06-26
Abstract
Abstract An electrochemical cell having a zinc negative electrode, a positive electrode, a saline electrolyte and a corrosion inhibitor added to the saline electrolyte to prevent corrosion of the zinc electrode by the electrolyte is disclosed. The inhibitor is ascorbic acid, which is added to the saline electrolyte preferably in proportions comprised between 700 and 900 mg/l. The mixture of the electrolyte and inhibitor is generally in paste form. The resultant inhibitor-containing electrolyte in practice does not corrode the zinc negative electrode of such cells during storage. Thus, prolonged storage of such cells, even in adverse tropical environments is possible.
Inventors
- 👤 Pierre Cerfon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:17
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/62; H01M4/628; H01M6/00; H01M6/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
57 words
An electric cell comprising a zinc negative electrode, a manganese dioxide positive electrode and saline electrolyte, said electrolyte comprising a mixture of starch, zinc chloride solution, ammonium chloride solution and ascorbic acid, said ascorbic acid serving as a corrosion inhibitor, and wherein said ascorbic acid is present in said mixture in a concentration ranging from 700-900 mg/l.
Claim 2
Dependent Claim
57 words
An electric cell comprising a zinc negative electrode, a manganese dioxide positive electrode and saline electrolyte, said electrolyte comprising a mixture of starch, zinc chloride solution, ammonium chloride solution and ascorbic acid, said ascorbic acid serving as a corrosion inhibitor, and wherein said ascorbic acid is present in said mixture in a concentration ranging from 700-900 mg/l.
Claim 3
Dependent Claim
38 words
An electric cell according to claim 1 wherein said mixture comprises proportionately approximately 175 grams of potato starch, 100 cc of 50% zinc chloride solution, 400 cc of saturated ammonium chloride solution and 0.5 grams of ascorbic acid.
Claim 4
Dependent Claim
19 words
An electric cell according to claim 1 wherein the concentration of said ascorbic acid is approximately 800/mg/l of electrolyte.
References Cited (Backward Citations)
US1370056A
Cited
US2399127A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-20 | 1980-01-19 | 1980-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-20 | 1984-01-19 | 1984-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-20 | 1988-01-19 | 1988-07-20 | $7700.00 | Window Closed / Lapsed |