US4435488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gelling agent for alkaline cells
Assignee: Duracell Inc USA
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Filing: 1982-03-08
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Granted: 1984-03-06
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Expires: 2002-03-08
Abstract
Abstract A novel gelling agent comprised of cross-linked CMC (carboxymethyl cellulose) is utilized as a gelling agent in the anode of alkaline electrochemical cells with improved cell performance and reduced cell gassing as compared to the commonly utilized non cross-linked CMC.
Inventors
- 👤 William S. Bahary
- 👤 Rowland A. Griffin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:21
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/22; H01M4/00; H01M4/02; H01M4/06; H01M4/62; H01M4/621; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
26 words
A method of gelling anodes for alkaline cells comprising the step of gelling an anode active material with cross-linked carboxymethyl cellulose and an alkaline electrolyte solution.
Claim 2
Independent Claim
26 words
A method of gelling anodes for alkaline cells comprising the step of gelling an anode active material with cross-linked carboxymethyl cellulose and an alkaline electrolyte solution.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein said anode active material is comprised of zinc.
Claim 4
Dependent Claim
16 words
The method of claim 1 wherein said alkaline electrolyte solution is comprised of a KOH solution.
Claim 5
Dependent Claim
31 words
The method of claim 1 wherein the degree of cross linking in said cross-linked carboxymethyl cellulose is between 0.01 to 10% based upon the number of individual glucose anhydride units therein.
Claim 6
Dependent Claim
16 words
The method of claim 4 wherein said degree of cross linking is between 0.1 to 4%.
Claim 7
Dependent Claim
27 words
The method of claim 1 wherein said alkaline cells contain cathodes comprised of a member of the group consisting of manganese dioxide, silver oxide and mercury oxide.
Claim 8
Dependent Claim
20 words
The method of claim 1 wherein said cross-linked carboxymethyl cellulose comprises between 0.5% to 7% by weight of said anode.
Claim 9
Dependent Claim
20 words
The method of claim 7 wherein said cross-linked carboxymethyl cellulose comprises between 1.6% to 4% by weight of said anode.
Claim 10
Dependent Claim
16 words
An anode blend for an electrochemical cell comprising an anode active powder and cross-linked carboxymethyl cellulose.
Claim 11
Dependent Claim
16 words
An anode blend for an electrochemical cell comprising an anode active powder and cross-linked carboxymethyl cellulose.
Claim 12
Dependent Claim
15 words
The anode blend of claim 8 wherein said active anode powder is comprised of zinc.
Claim 13
Dependent Claim
15 words
The anode blend of claim 10 wherein said blend further includes an aqueous KOH solution.
Claim 14
Dependent Claim
32 words
The anode blend of claim 10 wherein the degree of cross linking of said cross-linked carboxymethyl cellulose is between 0.01 to 10% based upon the number of individual glucose anhydride units therein.
Claim 15
Dependent Claim
17 words
The anode blend of claim 12 wherein said degree of cross linking is between 0.1 to 4%.
Claim 16
Dependent Claim
22 words
The anode blend of claim 9 wherein said cross-linked carboxymethyl cellulose comprises between 2.5% to 3% by weight of said anode blend.
Claim 17
Dependent Claim
24 words
An electrochemical cell comprising a gelled anode, a cathode and an aqueous alkaline electrolyte characterized in that said gelled anode contains cross-linked carboxymethyl cellulose.
Claim 18
Dependent Claim
24 words
An electrochemical cell comprising a gelled anode, a cathode and an aqueous alkaline electrolyte characterized in that said gelled anode contains cross-linked carboxymethyl cellulose.
Claim 19
Dependent Claim
15 words
The cell of claim 15 wherein said anode contains zinc as the active material thereof.
Claim 20
Dependent Claim
16 words
The cell of claim 16 wherein said aqueous alkaline electrolyte is comprised of a KOH solution.
Claim 21
Dependent Claim
28 words
The cell of claims 15, 16 or 17 wherein said cathode is comprised of a member of the group consisting of manganese dioxide, silver oxide and mercury oxide.
Claim 22
Dependent Claim
31 words
The cell of claim 15 wherein the degree of cross linking in said cross-linked carboxymethyl cellulose is between 0.01 to 10% based upon the number of individual glucose anhydride units therein.
Claim 23
Dependent Claim
16 words
The cell of claim 19 wherein said degree of cross linking is between 0.1 to 4%.
Claim 24
Dependent Claim
20 words
The cell of claim 15 wherein said cross-linked carboxymethyl cellulose comprises between 0.5% to 7% by weight of said anode.
Claim 25
Dependent Claim
20 words
The cell of claim 21 wherein said cross-linked carboxymethyl cellulose comprises between 1.6% to 4% by weight of said anode.
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) | 1987-03-06 | 1987-09-05 | 1988-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-06 | 1991-09-05 | 1992-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-06 | 1995-09-05 | 1996-03-06 | $7700.00 | Window Closed / Lapsed |