US3856576A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of treating electrolytic manganese dioxide
Assignee: Kerr McGee Corp
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Filing: 1973-06-25
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Granted: 1974-12-24
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Expires: 1993-06-25
Abstract
Abstract The present invention relates to an improved manganese dioxide. More particularly, the present invention relates to a method of improving the properties of electrolytic manganese dioxide for use as a depolarizer in primary cells. Broadly, the method comprises treating the electrolytic manganese dioxide in an aqueous treatment solution containing manganese ions and sulfuric acid.
Inventors
- 👤 M Prieto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:51
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/36; H01M4/48; H01M4/50; C; C25; C25B; C25B1/00; C25B1/01; C25B1/21; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
137 words
A METHOD OF TREATING ELECTRODEDEPOSITED MANGANESE DIOXIDE COMPRISING: A. PROVIDING AN ADMIXTURE COMPRISING MANGANESE DIOXIDE IN AN AQUEOUS TREATMENT SOLUTION OF SULFURIC ACID AND MANGANUOUS ION, SAID MANGANOUSS ION BEING PRESENT IN AN AMOUNT OF AT LEAST 1 GRAM PER LITER OF SOLUTION, SAID SULFURIC ACID BEING PRESENT IN AN AMOUNT SUFFICIENT TO PROVIDE A RATIO OF MANGANESE DIOXIDE BEING PRESENT IN AN 2:1 AND SAID MANGANESE DIOXIDE BEING PRESENT IN THE AMOUNT OF FROM ABOUT 150-1,500 GRAM PER LITER OF SOLUTION; B. MAINTAINING SAID ADMITURE AT A TREATMENT TEMPERATURE OF FROM ABOUT 70*C. TO ABOUT THE BOILING POINT OF THE ADMIXTURE FOR A TIME OF FROM 2 TO 10 HOURS; C. AGITATING SAID ADMITURE DURING AT LEAST A PORTION OF THE TIME IT IS MAINTAINED AT SAID TREATMENT TEMPERATURE; AND D. RECOVERING THE TREATED MANGANESE DIOXIDE.
Claim 2
Independent Claim
137 words
A METHOD OF TREATING ELECTRODEDEPOSITED MANGANESE DIOXIDE COMPRISING: A. PROVIDING AN ADMIXTURE COMPRISING MANGANESE DIOXIDE IN AN AQUEOUS TREATMENT SOLUTION OF SULFURIC ACID AND MANGANUOUS ION, SAID MANGANOUSS ION BEING PRESENT IN AN AMOUNT OF AT LEAST 1 GRAM PER LITER OF SOLUTION, SAID SULFURIC ACID BEING PRESENT IN AN AMOUNT SUFFICIENT TO PROVIDE A RATIO OF MANGANESE DIOXIDE BEING PRESENT IN AN 2:1 AND SAID MANGANESE DIOXIDE BEING PRESENT IN THE AMOUNT OF FROM ABOUT 150-1,500 GRAM PER LITER OF SOLUTION; B. MAINTAINING SAID ADMITURE AT A TREATMENT TEMPERATURE OF FROM ABOUT 70*C. TO ABOUT THE BOILING POINT OF THE ADMIXTURE FOR A TIME OF FROM 2 TO 10 HOURS; C. AGITATING SAID ADMITURE DURING AT LEAST A PORTION OF THE TIME IT IS MAINTAINED AT SAID TREATMENT TEMPERATURE; AND D. RECOVERING THE TREATED MANGANESE DIOXIDE.
Claim 3
Dependent Claim
29 words
A method as set forth in claim 1 wherein said manganous ion is present in an amount of from about 10 to 100 grams per liter of treatment solution.
Claim 4
Dependent Claim
23 words
A method as set forth in claim 1 wherein said ratio of manganous ion to sulfuric acid is from about 1:8 to 1:1.
Claim 5
Dependent Claim
20 words
A method as set forth in claim 1 wherein the treatment temperature is about the boiling point of the admixture.
Claim 6
Dependent Claim
19 words
A method as set forth in claim 1 wherein the treatment time is from about 5 to 8 hours.
Claim 7
Dependent Claim
69 words
A method as set forth in claim 1 wherein the treatment solution consists essentially of an aqueous solution of manganous ion and sulfuric acid, said manganous ion being present in an amount of from about 10 to 100 grams per liter of solution and said sulfuric acid being present in an amount sufficient to provide a ratio of manganous ion to acid ratio of from about 1:8 to 1:1.
Claim 8
Dependent Claim
20 words
A method as set forth in claim 6 wherein the treatment temperature is about the boiling point of the admixture.
Claim 9
Dependent Claim
19 words
A method as set forth in claim 7 wherein the treatment time is from about 5 to 8 hours.
Claim 10
Dependent Claim
24 words
A method as set forth in claim 8 wherein said admixture is continuously agitated during the time it is maintained at the treatment temperature.
Claim 11
Dependent Claim
22 words
A method as set forth in claim 9 wherein the ratio of manganous ion to sulfuric acid is from about 0.25:1 0.5:1.
References Cited (Backward Citations)
CA540001A
Cited
US2215530A
Cited
US2667405A
Cited
US2956860A
Cited
DE1140183B
Cited
US3065155A
Cited
US3356452A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |