Patent US3887398A successfully refreshed from Google Patents.
US3887398A
Expired / Lapsed
US
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Prevention of deterioration of lead dioxide
Assignee: United States Department of the Army
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Filing: 1973-11-28
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Granted: 1975-06-03
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Expires: 1993-11-28
Abstract
Abstract An electrode for a reserve battery comprising a metal strip having a first layer of lead dioxide deposited from a nitrate bath and a second layer of lead dioxide deposited from an acetate bath, the latter having been thermally treated to convert the same to a different allotropic form. The electrode has also been treated to reduce the amount of oxidizable material to less than 0.4 coulombs/in2 by an anodization process disclosed herein. The electrode is characterized by the ability to withstand storage at high temperatures for several months and remain substantially stable.
Inventors
- 👤 David Singman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:38
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/06; H01M4/08; H01M6/00; H01M6/30; H01M6/36
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
29 words
An electrode for an electrical cell comprising a base plate having a layer of an active allotrope of lead dioxide and containing less than 0.4 coulombs/in2 of oxidizable material.
Claim 2
Dependent Claim
29 words
An electrode for an electrical cell comprising a base plate having a layer of an active allotrope of lead dioxide and containing less than 0.4 coulombs/in2 of oxidizable material.
Claim 3
Dependent Claim
29 words
AN ELECTRODE FOR AN ELECTRICAL CELL COMPRISING A BASE PLATE HAVING A LAYER OF AN ACTIVE ALLOTROPE OF LEAD DIOXIDE AND CONTAINING LESS THAN 0.4 COULOMBS/IN2 OF OXIDIZABLE MATERIAL.
Claim 4
Dependent Claim
29 words
AN ELECTRODE FOR AN ELECTRICAL CELL COMPRISING A BASE PLATE HAVING A LAYER OF AN ACTIVE ALLOTROPE OF LEAD DIOXIDE AND CONTAINING LESS THAN 0.4 COULOMBS/IN2 OF OXIDIZABLE MATERIAL.
Claim 5
Dependent Claim
19 words
An electrode for an electrical cell according to claim 1 in which the lead dioxide layer has been anodized.
Claim 6
Dependent Claim
25 words
The electrode of claim 1 comprising a base plate, an adherent layer of tetragonal lead dioxide and an over layer of rhombohedral allotrope lead dioxide.
Claim 7
Dependent Claim
11 words
The electrode according to claim 3 wherein the electrode is anodized.
Claim 8
Dependent Claim
64 words
In a process for the production of an allotrope of lead dioxide, comprising depositing lead dioxide from an acetate bath and thermally converting the deposited material to an allotrope form by heating the material in a confined enclosure to a temperature of about 110* C., the improvement which comprises reducing the content of oxidizable material in the lead oxide to less than 0.4 coulombs/in2.
Claim 9
Dependent Claim
64 words
In a process for the production of an allotrope of lead dioxide, comprising depositing lead dioxide from an acetate bath and thermally converting the deposited material to an allotrope form by heating the material in a confined enclosure to a temperature of about 110* C., the improvement which comprises reducing the content of oxidizable material in the lead oxide to less than 0.4 coulombs/in2.
Claim 10
Dependent Claim
22 words
In the process according to claim 5 in which the reduction in oxidizable material is by anodization of the lead dioxide deposit.
Claim 11
Dependent Claim
19 words
In the process according to claim 6 in which the anodization is conducted in a dilute nitric acid bath.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |