US4246253A
Expired / Lapsed
US
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MnO2 derived from LiMn2 O4
Assignee: Edgewell Personal Care Brands LLC
•
Filing: 1978-09-29
•
Granted: 1981-01-20
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Expires: 1998-09-29
Abstract
Abstract A new form of manganese dioxide having an x-ray diffraction pattern resembling none of the x-ray patterns of the known forms of manganese dioxide is manufactured by acid treatment of LiMn2O4.
Inventors
- 👤 James C. Hunter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:13
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/36; H01M4/48; H01M4/50; H01M4/502; C; C01; C01G; C01G45/00; C01G45/02; C01G45/024; C01P; C01P2002/00; C01P2002/70; C01P2002/72; C01P2006/00; C01P2006/80; H01M6/00; H01M6/04; H01M6/06; H01M6/14; H01M6/16; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
34 words
A manganese dioxide composition having the x-ray diffraction pattern: ______________________________________
dA
______________________________________
4.64 ± 0.02
2.42 ± 0.02
2.31 ± 0.02
2.01 ± 0.02
1.84 ± 0.02
1.55 ± 0.02
1.42 ± 0.02
______________________________________
Claim 2
Dependent Claim
34 words
A manganese dioxide composition having the x-ray diffraction pattern: ______________________________________
dA
______________________________________
4.64 ± 0.02
2.42 ± 0.02
2.31 ± 0.02
2.01 ± 0.02
1.84 ± 0.02
1.55 ± 0.02
1.42 ± 0.02
______________________________________
Claim 3
Dependent Claim
55 words
The manganese dioxide of claim 1 wherein the relative intensities of the x-ray diffraction peaks are as follows: ______________________________________
Relative Intensity
dA (Fe Kα Radiation)
______________________________________
4.64 ± 0.02
S
2.42 ± 0.02
S
2.31 ± 0.02
W
2.01 ± 0.02
S
1.84 ± 0.02
W
1.55 ± 0.02
W
1.42 ± 0.02
M
______________________________________
Claim 4
Dependent Claim
56 words
The manganese dioxide of claim 1 or 2 wherein the relative intensities of the x-ray diffraction peaks are as follows: ______________________________________
Relative Intensity
dA (Cu KαRadiation)
______________________________________
4.64 ± 0.02 S
2.42 ± 0.02 M
2.31 ± 0.02 W
2.01 ± 0.02 M
1.84 ± 0.02 W
1.55 ± 0.02 W
1.42 ± 0.02 W
______________________________________
Claim 5
Dependent Claim
34 words
A method of manufacturing a manganese dioxide composition as defined in claim 1 comprising acid-treating LiMn 2 O 4 with an aqueous acid solution until the pH of the solution stabilizes below about 2.5.
Claim 6
Dependent Claim
55 words
The method of claim 4 wherein the acid treatment comprises the steps of: (a) suspending LiMn 2 O 4 in water; (b) adding aqueous acid solution while stirring; (c) monitoring the pH of the solution phase; and (d) continuing the acid addition until the pH of the solution phase stabilizes at below about pH 2.5.
Claim 7
Dependent Claim
28 words
The method of claim 5 comprising the additional steps of: (e) washing until the wash water is about neutral; (f) filtering; and (g) drying the MnO 2 product.
Claim 8
Independent Claim
28 words
The method of claims 5 or 6 wherein the acid addition step (d) is continued until the pH of the solution phase stabilizes at below about pH 2.0.
Claim 9
Independent Claim
24 words
The method of claims 5 or 6 wherein the acid is selected from the group consisting of sulfuric acid, hydrochloric acid, and nitric acid.
References Cited (Backward Citations)
CA714989A
Cited
DE1152095B
Cited
US3427128A
Cited
FR1443907A
Cited
US3959021A
Cited
US3856576A
Cited
JPS5124999A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-20 | 1984-07-21 | 1985-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-20 | 1988-07-21 | 1989-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-20 | 1992-07-21 | 1993-01-20 | $7700.00 | Window Closed / Lapsed |