US4840644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cell corrosion reduction
Assignee: Duracell Inc USA
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Filing: 1988-01-26
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Granted: 1989-06-20
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Expires: 2008-01-26
Abstract
Abstract Corrosion is reduced in aqueous electrochemical cells having zinc anodes comprised of single crystal zinc particles by the addition of small amounts of a gas inhibiting surfactant, for example, an organic phosphate inhibitor such as RA600 from GAF Corp. to the cell. A synergistically lowered rate of corrosion and cell gassing is obtained even with reduction of mercury content.
Inventors
- 👤 Purush Chalilpoyil
- 👤 Frank E. Parsen
- 👤 Chih-Chung Wang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:56
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/62; H01M4/628; H01M6/00; H01M6/04; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49108
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A method for reducing the gassing of an anode subject to gassing, said method comprising the steps of making single crystal particles of the metal utilized as the active anode of said cell; forming said single crystal particles ino an anode for said cell wherein said anode comprises mercury amalgamated single crystal particles and wherein said mercury is present in said anode in an amount less than about 1.5% by weight thereof; and adding a surface active heteropolar material having a polar affinity to said anode to said cell, wherein said heteropolar material comprises an organic phosphate ester having the formula: ##STR2## where x+y=3 M=H, ammonia, amino, or an alkali or alkaline earth metal and R=phenyl or alkyl or alkylaryl of 6-28 carbon atoms.
Claim 2
Independent Claim
124 words
A method for reducing the gassing of an anode subject to gassing, said method comprising the steps of making single crystal particles of the metal utilized as the active anode of said cell; forming said single crystal particles ino an anode for said cell wherein said anode comprises mercury amalgamated single crystal particles and wherein said mercury is present in said anode in an amount less than about 1.5% by weight thereof; and adding a surface active heteropolar material having a polar affinity to said anode to said cell, wherein said heteropolar material comprises an organic phosphate ester having the formula: ##STR2## where x+y=3 M=H, ammonia, amino, or an alkali or alkaline earth metal and R=phenyl or alkyl or alkylaryl of 6-28 carbon atoms.
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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) | 1992-06-19 | 1992-12-19 | 1993-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-19 | 1996-12-19 | 1997-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-19 | 2000-12-19 | 2001-06-20 | $7700.00 | Window Closed / Lapsed |