US5489493A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkaline manganese dioxide cell
Assignee: Energizer Brands LLC
•
Filing: 1995-06-07
•
Granted: 1996-02-06
•
Expires: 2015-06-07
Abstract
Abstract A hermetically sealed alkaline cell having an anode such as a zinc anode, an aqueous alkaline electrolyte solution and a manganese dioxide cathode in which the cathode is composed of a mixture of a minor amount of highly porous manganese dioxide and a major amount of low porosity manganese dioxide and wherein said mixture provides ion diffusion paths through the cathode.
Inventors
- 👤 Lewis F. Urry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:50
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/36; H01M4/48; H01M4/50; H01M4/362; H01M4/364; H01M2300/00; H01M2300/0002; H01M2300/0014; H01M4/06; H01M6/00; H01M6/04; H01M6/045; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
90 words
A hermetically sealed alkaline electrochemical cell comprising an anode active material, an aqueous alkaline electrolyte solution, a manganese dioxide cathode and a separator disposed between the anode and cathode and whereby the cathode comprises a mixture of highly porous manganese dioxide having a porosity of between 22% and 70%, with low porosity manganese dioxide, having a porosity of less than 22% and wherein the weight percent of the highly porous manganese dioxide is between 1 weight percent to 35 weight percent of the weight of the low porosity manganese dioxide.
Claim 2
Dependent Claim
90 words
A hermetically sealed alkaline electrochemical cell comprising an anode active material, an aqueous alkaline electrolyte solution, a manganese dioxide cathode and a separator disposed between the anode and cathode and whereby the cathode comprises a mixture of highly porous manganese dioxide having a porosity of between 22% and 70%, with low porosity manganese dioxide, having a porosity of less than 22% and wherein the weight percent of the highly porous manganese dioxide is between 1 weight percent to 35 weight percent of the weight of the low porosity manganese dioxide.
Claim 3
Dependent Claim
23 words
The hermetically sealed alkaline electrochemical cell of claim 1 wherein said highly porous manganese dioxide has a porosity of between 25% and 65%.
Claim 4
Dependent Claim
23 words
The hermetically sealed alkaline electrochemical cell of claim 1 wherein said highly porous manganese dioxide has a porosity of between 50% and 60%.
Claim 5
Dependent Claim
23 words
The hermetically sealed alkaline electrochemical cell of claim 1 wherein said low porosity manganese dioxide has a porosity of between 10% and 22%.
Claim 6
Dependent Claim
23 words
The hermetically sealed alkaline electrochemical cell of claim 4 wherein said low porosity manganese dioxide has a porosity of between 10% and 16%.
Claim 7
Dependent Claim
37 words
The hermetically sealed alkaline electrochemical cell of claim 1 wherein the weight percent of the highly porous manganese dioxide is between 5 weight percent to 35 weight percent of the weight of the low porosity manganese dioxide.
Claim 8
Dependent Claim
36 words
The hermetically sealed alkaline electrochemical cell of claim 4 wherein the weight percent of the highly porous manganese dioxide is between 5 weight percent to 35 weight percent of the weight of the solid manganese dioxide.
Claim 9
Dependent Claim
37 words
The hermetically sealed alkaline electrochemical cell of claim 5 wherein the weight percent of the highly porous manganese dioxide is between 5 weight percent to 35 weight percent of the weight of the low porosity manganese dioxide.
Claim 10
Dependent Claim
37 words
The hermetically sealed alkaline electrochemical cell of claim 1 wherein the weight percent of the highly porous manganese dioxide is between 5 weight percent to 20 weight percent of the weight of the low porosity manganese dioxide.
Claim 11
Dependent Claim
62 words
The hermetically sealed alkaline electrochemical cell of claim 1 wherein the porosity of the highly porous manganese dioxide is between 25% and 65% wherein the porosity of the low porosity manganese dioxide is between 10% and 22%; and the weight percent of the highly porous manganese dioxide is between 5 weight percent to 35 weight percent of the low porosity manganese dioxide.
Claim 12
Dependent Claim
20 words
The hermetically sealed alkaline electrochemical cell of claim 1 wherein the porosity of the cathode is between 15% and 35%.
Claim 13
Dependent Claim
20 words
The hermetically sealed alkaline electrochemical cell of claim 10 wherein the porosity of the cathode is between 15% and 35%.
Claim 14
Dependent Claim
20 words
The hermetically sealed alkaline electrochemical cell of claim 1 wherein the highly porous manganese dioxide is chemically synthesized manganese dioxide.
Claim 15
Dependent Claim
20 words
The hermetically sealed alkaline electrochemical cell of claim 1 wherein the low porosity manganese dioxide is electrolytically deposited manganese dioxide.
Claim 16
Dependent Claim
20 words
The hermetically sealed alkaline electrochemical cell of claim 14 wherein the highly porous manganese dioxide is chemically synthesized manganese dioxide.
Claim 17
Dependent Claim
62 words
The hermetically sealed alkaline electrochemical cell of claim 13 wherein the porosity of the highly porous manganese dioxide is between 25% and 65%; wherein the porosity of the low porosity manganese dioxide is between 10% and 22%; and the weight percent of the highly porous manganese dioxide is between 1 weight percent to 35 weight percent of the low porosity manganese dioxide.
Claim 18
Dependent Claim
62 words
The hermetically sealed alkaline electrochemical cell of claim 14 wherein the porosity of the highly porous manganese dioxide is between 25% and 65%; wherein the porosity of the low porosity manganese dioxide is between 10% and 22%; and the weight percent of the highly porous manganese dioxide is between 1 weight percent to 35 weight percent of the low porosity manganese dioxide.
Claim 19
Dependent Claim
62 words
The hermetically sealed alkaline electrochemical cell of claim 15 wherein the porosity of the highly porous manganese dioxide is between 25% and 65%; wherein the porosity of the low porosity manganese dioxide is between 10% and 22%; and the weight percent of the higly porous manganese dioxide is between 1 weight percent to 35 weight percent of the low porosity manganese dioxide.
Claim 20
Dependent Claim
16 words
The hermetically sealed alkaline electrochemical cell of claim 1 wherein the alkaline electrolyte is potassium hydroxide.
Claim 21
Dependent Claim
16 words
The hermetically sealed alkaline electrochemical cell of claim 1 wherein the anode is a zinc anode.
References Cited (Backward Citations)
US3748184A
Cited
US4121018A
Cited
US4105830A
Cited
GB2109154A
Cited
EP0140973A1
Cited
US4894296A
Cited
US5079106A
Cited
US5277890A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-02-05 | 1999-08-07 | 2000-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-02-05 | 2003-08-07 | 2004-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-02-05 | 2007-08-07 | 2008-02-06 | $7700.00 | Window Closed / Lapsed |