US3920478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Divalent silver oxide-zinc cell having a unipotential discharge level
Assignee: Edgewell Personal Care Brands LLC
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Filing: 1974-06-25
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Granted: 1975-11-18
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Expires: 1994-06-25
Abstract
Abstract An alkaline silver oxide-zinc cell having a negative electrode, an alkaline electrolyte, a positive electrode comprising divalent silver oxide housed in a positive terminal container, a separator disposed between the negative electrode and the positive electrode, and wherein a discontinuous oxidizable metal, such as a zinc screen, is interposed between the positive electrode and the inner wall of the positive terminal and/or between the positive electrode and the separator so as to achieve a unipotential discharge level on low drain conditions.
Inventors
- 👤 Akiya Kozawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:11
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/04; H01M6/06; H01M6/12
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
99 words
IN AN ALKALINE SILVER OXIDE CELL COMPRISING A NEGATIVE ELECTRODE, A POSITIVE ELECTRODE HOUSED IN A CONDUCTIVE CONTAINERHAVING A BOTTOM SURFACE AND A SIDE WALL, A SEPARATOR DISPOSED BETWEEN SAID NAGATIVE ELECTRODE AND SAID POSITIVE ELECTRODE, AND AN ELECTROLYTE; SAID POSITIVE ELECTRODE COMPRISING DIVALENT SILVER OXIDE, THE IMPROVEMENT WHEREIN A DISCONTINOUS OXIDIZABLE METAL MATERIALIS INTERPOSED BETWEEN AND IN ELECTRICAL AND PHYSICAL CONTACT WITH SAID POSITIVE ELECTRODE AND THE INNER SURFACE OF THE CONDUCTIVE CONTAINER,SO THAT THE REACTION OF THE OXIDIZABLE METALIN THE PRESENCE OF THE ELECTROLYTE WILL PRODUCE A SUBSTANTIALLY UNIPOTENTIAL DUSCHARGE OVER THE USEFUL LIFE OF THE CELL.
Claim 2
Dependent Claim
99 words
IN AN ALKALINE SILVER OXIDE CELL COMPRISING A NEGATIVE ELECTRODE, A POSITIVE ELECTRODE HOUSED IN A CONDUCTIVE CONTAINERHAVING A BOTTOM SURFACE AND A SIDE WALL, A SEPARATOR DISPOSED BETWEEN SAID NAGATIVE ELECTRODE AND SAID POSITIVE ELECTRODE, AND AN ELECTROLYTE; SAID POSITIVE ELECTRODE COMPRISING DIVALENT SILVER OXIDE, THE IMPROVEMENT WHEREIN A DISCONTINOUS OXIDIZABLE METAL MATERIALIS INTERPOSED BETWEEN AND IN ELECTRICAL AND PHYSICAL CONTACT WITH SAID POSITIVE ELECTRODE AND THE INNER SURFACE OF THE CONDUCTIVE CONTAINER,SO THAT THE REACTION OF THE OXIDIZABLE METALIN THE PRESENCE OF THE ELECTROLYTE WILL PRODUCE A SUBSTANTIALLY UNIPOTENTIAL DUSCHARGE OVER THE USEFUL LIFE OF THE CELL.
Claim 3
Dependent Claim
29 words
The alkaline silver oxide cell of claim 1 wherein said positive electrode is a mixture of monovalent silver oxide and at least 50% by weight of divalent silver oxide.
Claim 4
Dependent Claim
29 words
The alkaline silver oxide cell of claim 2 wherein said positive electrode is a mixture of 50% by weight monovalent silver oxide and 50% by weight divalent silver oxide.
Claim 5
Dependent Claim
28 words
The alkaline silver oxide cell of claim 1 wherein the discontinuous oxidizable metal material is selected from the group consisting of zinc, copper, silver, tin, cadmium, and lead.
Claim 6
Dependent Claim
17 words
The alkaline silver oxide cell of claim 4 wherein said discontinuous oxidizable metal is a zinc screen.
Claim 7
Dependent Claim
15 words
The alkaline silver oxide cell of claim 5 wherein said metal material is expanded zinc.
Claim 8
Dependent Claim
16 words
The alkaline silver oxide cell of claim 5 wherein said metal material is a zinc mesh.
Claim 9
Dependent Claim
17 words
The alkaline silver oxide cell of claim 5 wherein said metal material is a perforated zinc sheet.
Claim 10
Dependent Claim
18 words
The alkaline silver oxide cell of claim 4 wherein said metal material is composed of discrete zinc particles.
Claim 11
Dependent Claim
17 words
The alkaline silver oxide cell of claim 3 wherein the discontinuous metal material is a zinc screen.
Claim 12
Dependent Claim
17 words
The alkaline silver oxiDe cell of claim 3 wherein the discontinuous metal material is a zinc strip.
Claim 13
Dependent Claim
32 words
An alkaline silver oxide cell as in claim 1 wherein a second discontinuous oxidizable metal material is interposed between, and electrically and physically in contact with, said positive electrode and said separator.
Claim 14
Dependent Claim
47 words
The alkaline silver oxide cell of claim 12 wherein the discontinuous oxidizable metal material interposed between the positive electrode and the conductive container is a zinc screen and wherein the second discontinuous oxidizable metal material interposed between the positive electrode and the separator is a zinc screen.
Claim 15
Dependent Claim
68 words
In an alkaline silver oxide cell comprising a negative electrode, a positive electrode housed in a conductive container having a bottom surface and side wall, a separator between said negative electrode and said positive electrode, and an electrolyte; said positive electrode comprising divalent silver, the improvement wherein a discontinuous oxidizable metal material is disposed between and in electrical and physical contact with said positive electrode and said separator.
Claim 16
Dependent Claim
68 words
In an alkaline silver oxide cell comprising a negative electrode, a positive electrode housed in a conductive container having a bottom surface and side wall, a separator between said negative electrode and said positive electrode, and an electrolyte; said positive electrode comprising divalent silver, the improvement wherein a discontinuous oxidizable metal material is disposed between and in electrical and physical contact with said positive electrode and said separator.
Claim 17
Dependent Claim
29 words
The alkaline silver oxide cell of claim 14 wherein said positive electrode is a mixture of monovalent silver oxide and at least 50% by weight of divalent silver oxide.
Claim 18
Dependent Claim
29 words
The alkaline silver oxide cell of claim 15 wherein said positive electrode is a mixture of 50% by weight monovalent silver oxide and 50% by weight divalent silver oxide.
Claim 19
Dependent Claim
28 words
The alkaline silver oxide cell of claim 14 wherein the discontinuous oxidizable metal material is selected from the group consisting of zinc, copper, silver, tin, cadmium, and lead.
Claim 20
Dependent Claim
17 words
The alkaline silver oxide cell of claim 17 wherein said discontinuous oxidizable metal is a zinc screen.
Claim 21
Dependent Claim
15 words
The alkaline silver oxide cell of claim 18 wherein said metal material is expanded zinc.
Claim 22
Dependent Claim
16 words
The alkaline silver oxide cell of claim 18 wherein said metal material is a zinc mesh.
Claim 23
Dependent Claim
17 words
The alkaline silver oxide cell of claim 18 wherein said metal material is a perforated zinc sheet.
Claim 24
Dependent Claim
17 words
The alkaline silver oxide cell of claim 16 wherein the discontinuous metal material is a zinc screen.
Claim 25
Dependent Claim
16 words
The alkaline silver oxide of claim 14 wherein the discontinuous metal material is a zinc strip.
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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) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |