US4590059A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of manganese dioxide
Assignee: Edgewell Personal Care Brands LLC
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Filing: 1985-06-27
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Granted: 1986-05-20
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Expires: 2005-06-27
Abstract
Abstract Manganese dioxide is produced from manganous salts by mixing a manganous salt with an alkali metal permanganate and/or ammonium permanganate followed by heating such mixture to about 150° C. under an oxygen-containing atmosphere until at least 85% of the manganous salt is converted to manganese dioxide and then further elevating the temperature to about 250° C. and maintaining this temperature until the surface area of the manganese dioxide is between about 3 square meters per gram and about 12 square meters per gram.
Inventors
- 👤 Geoffrey W. Mellors
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:43
CPC Classifications
C; C01; C01G; C01G45/00; C01G45/02; C01G45/024; H; H01; H01M; H01M4/00; H01M4/02; H01M4/36; H01M4/48; H01M4/50; C01P; C01P2002/00; C01P2002/70; C01P2002/72; C01P2002/74; C01P2006/00; C01P2006/12; C01P2006/40; C01P2006/80; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
128 words
A process for the production of manganese dioxide comprising the steps of: (a) mixing at least one manganous salt (Mn 2+ ) with at least one compound (MnO 4 - ) selected from the group consisting of alkali metal permangantes and ammonium permanganate to produce a homogeneous solid mixture; (b) heating the homogeneous mixture of step (a) to between about 120° C. and about 180° C. in an oxygen-containing atmosphere until at least 85% of the manganous salt is converted into manganese dioxide; and (c) heating the product produced in step (b) in an oxygen-containing atmosphere at between about 210° C. and about 300° C. until the surface area of the manganese dioxide is between about 3 square meters per gram and about 12 square meters per gram.
Claim 2
Dependent Claim
128 words
A process for the production of manganese dioxide comprising the steps of: (a) mixing at least one manganous salt (Mn 2+ ) with at least one compound (MnO 4 - ) selected from the group consisting of alkali metal permangantes and ammonium permanganate to produce a homogeneous solid mixture; (b) heating the homogeneous mixture of step (a) to between about 120° C. and about 180° C. in an oxygen-containing atmosphere until at least 85% of the manganous salt is converted into manganese dioxide; and (c) heating the product produced in step (b) in an oxygen-containing atmosphere at between about 210° C. and about 300° C. until the surface area of the manganese dioxide is between about 3 square meters per gram and about 12 square meters per gram.
Claim 3
Dependent Claim
33 words
The process of claim 1 wherein, in step (a) the manganous salt and the compound are mixed in a molecular ratio of Mn 2+ /MnO 4 - of between about 3 and 90.
Claim 4
Dependent Claim
21 words
The process of claim 2 wherein the molecular ratio of Mn 2+ /MnO 4 - is between about 7 and 17.
Claim 5
Dependent Claim
29 words
The process claim 1, 2 or 3 wherein in step (c) the surface area of the manganese dioxide is between about 5 and about 10 square meters per gram.
Claim 6
Dependent Claim
28 words
The process of claim 1, 2 or 3 wherein the temperature in step (b) is maintained for a period of time between about 1 and about 4 hours.
Claim 7
Dependent Claim
26 words
The process of claim 5 wherein the temperature in step (c) is maintained for a period of time between about 1 hour and about 4 hours.
Claim 8
Dependent Claim
29 words
The process of claim 5 wherein the temperature in step (b) is about 150° C., and such temperature is maintained for a period of time of about 2 hours.
Claim 9
Dependent Claim
25 words
The process of claim 7 wherein the temperature is elevated in step (c) to 250° C. and maintained at this temperature for about 2 hours.
Claim 10
Dependent Claim
30 words
The process of claim 1, 2, or 3 wherein the manganous salt is selected from the group consisting of manganous nitrate, manganous chloride, manganous sulfate, manganous carbonate and mixtures thereof.
Claim 11
Dependent Claim
26 words
The process of claim 9 wherein the alkali metal permanganate is selected from the group consisting of sodium permanganate, lithium permanganate, potassium permanganate and mixtures thereof.
Claim 12
Dependent Claim
19 words
The process of claim 1 wherein the manganous salt is manganous nitrate hexahydrate and the compound is potassium permanganate.
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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) | 1989-05-19 | 1989-11-18 | 1990-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-19 | 1993-11-18 | 1994-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-19 | 1997-11-18 | 1998-05-20 | $7700.00 | Window Closed / Lapsed |