US4476104A
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Manganese dioxide and process for the production thereof
Assignee: Edgewell Personal Care Brands LLC
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Filing: 1983-03-24
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Granted: 1984-10-09
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Expires: 2003-03-24
Abstract
Abstract Manganese dioxide is produced from manganous nitrate hexahydrate-containing material by heating such manganous nitrate-containing material to about 150 DEG C. under an oxygen-containing atmosphere until a substantially complete decomposition to manganese dioxide has occurred, further elevating the temperature to about 250 DEG C., and maintaining this temperature until the manganese dioxide has a surface area no greater than about 15 m2/gm and a high degree of amorphousness relative to crystalline beta manganese dioxide.
Inventors
- 👤 Geoffrey W. Mellors
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:21
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; C01P2002/02; C01P2002/70; C01P2002/72; C01P2006/00; C01P2006/12; H01M6/00; H01M6/14; H01M6/16
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
74 words
Manganese dioxide having a surface area no greater than about 15 square meters/gram and having an X-ray diffraction pattern indicating relative intensities, when compared with crystalline beta manganese dioxide, of no greater than about 30% at d value 3.12 Å, of no greater than about 80% at d value 2.41 Å, of no greater than about 65% at d value 1.63 Å0 and of no greater than about 65% at d value 1.31 Å.
Claim 2
Dependent Claim
74 words
Manganese dioxide having a surface area no greater than about 15 square meters/gram and having an X-ray diffraction pattern indicating relative intensities, when compared with crystalline beta manganese dioxide, of no greater than about 30% at d value 3.12 Å, of no greater than about 80% at d value 2.41 Å, of no greater than about 65% at d value 1.63 Å0 and of no greater than about 65% at d value 1.31 Å.
Claim 3
Dependent Claim
18 words
The manganese dioxide of claim 1 wherein the surface area is no greater than about 10 square meters/gram.
Claim 4
Dependent Claim
18 words
The manganese dioxide of claim 1 wherein the surface area is no greater than about 5 square meters/gram.
Claim 5
Dependent Claim
43 words
The manganese dioxide of claim 1 wherein said manganese dioxide will not pick up more than about 750 parts per million of water in 5 hours when exposed to an atmosphere possessing a relative humidity of 20% at a temperature of 21° C.
Claim 6
Dependent Claim
143 words
A process for the production of manganese dioxide from manganous nitrate hexahydrate-containing material comprising the steps of: (a) heating in an oxygen-containing atmosphere manganous nitrate hexahydrate-containing material to between about 120° C. and about 180° C. until a substantially complete decomposition of the manganous nitrate into manganese dioxide has occurred; and (b) further elevating the temperature to between about 210° C. and about 300° C., and maintaining this temperature until the manganese dioxide has a surface area of no greater than about 15 m 2 /gm and an X-ray diffraction pattern indicating relative intensities, when compared with crystalline beta manganese dioxide, of no greater than about 30% at d value 3.12 Å, no greater than about 80% at d value 2.41 Å, no greater than about 65% at d value 1.63 Å and no greater than about 65% at d value 1.31 Å.
Claim 7
Dependent Claim
143 words
A process for the production of manganese dioxide from manganous nitrate hexahydrate-containing material comprising the steps of: (a) heating in an oxygen-containing atmosphere manganous nitrate hexahydrate-containing material to between about 120° C. and about 180° C. until a substantially complete decomposition of the manganous nitrate into manganese dioxide has occurred; and (b) further elevating the temperature to between about 210° C. and about 300° C., and maintaining this temperature until the manganese dioxide has a surface area of no greater than about 15 m 2 /gm and an X-ray diffraction pattern indicating relative intensities, when compared with crystalline beta manganese dioxide, of no greater than about 30% at d value 3.12 Å, no greater than about 80% at d value 2.41 Å, no greater than about 65% at d value 1.63 Å and no greater than about 65% at d value 1.31 Å.
Claim 8
Dependent Claim
24 words
The process of claim 5 wherein the temperature in step (a) is maintained for a period of between about 1 and about 4 hours.
Claim 9
Dependent Claim
24 words
The process of claim 6 wherein the temperature in step (b) is maintained for a period of between about 1 and about 4 hours.
Claim 10
Dependent Claim
27 words
The process of claim 5 wherein the temperature in step (a) is about 150° C., and such temperature is maintained for a period of about 2 hours.
Claim 11
Dependent Claim
25 words
The process of claim 8 wherein the temperature is elevated in step (b) to 250° C. and maintained at this temperature for about 2 hours.
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) | 1987-10-09 | 1988-04-09 | 1988-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-09 | 1992-04-09 | 1992-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-09 | 1996-04-09 | 1996-10-09 | $7700.00 | Window Closed / Lapsed |