US3660167A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkaline dry cell
Assignee: Individual
•
Filing: 1970-11-04
•
Granted: 1972-05-02
•
Expires: 1990-11-04
Abstract
Abstract An alkaline dry cell of high energy density in which a cathode of powdered manganese dioxide, carbon, and graphite has dispersed throughout it, short filaments of stainless steel, long filaments of stainless steel, and stainless steel powder.
Inventors
- 👤 Cho Kin Ching
- 👤 Walter Cohen
- 👤 Stanley Tseng
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:42
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/22; H01M4/00; H01M4/02; H01M4/62; H01M4/624; H01M50/00; H01M50/50; H01M50/543; H01M50/552; H01M50/559; H01M6/04; H01M6/06; H01M6/08; H01M4/625
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
38 words
The device according to claim 1 in which the percentage composition of the cathode by weight is: stainless steel powder 5-17% long stainless steel filaments 2-8% short stainless steel filaments 3.4-8% manganese dioxide, carbon andgraphite 57-77.6% water 12%
Claim 2
Dependent Claim
19 words
a mixture of manganese dioxide, graphite, carbon, stainless steel powder and short stainless steel filaments dispersed throughout the wad,
Claim 3
Dependent Claim
13 words
the wad and dispersed material compressed to a dense, hard, self sustaining body.
Claim 4
Dependent Claim
43 words
The device according to claim 1 in which the composition of the cathode by weight is: stainless steel powder .5-1.5 grams short stainless steel filaments .2-.8 grams manganese dioxide 5.5-6.5 grams carbon .3-.5 grams graphite .5-1.5 grams long stainless steel filaments .2-.8 grams
Claim 5
Dependent Claim
36 words
The device according to claim 1 and: a. an anode surrounding the cathode, b. a preformed liner of electrically nonconductive material sealed around the anode and cathode, c. a protective electrically conductive jacket surrounding the liner.
Claim 6
Dependent Claim
22 words
The device according to claim 1 and: a. a pin axially inserted in the cathode, b. a cap attached to the pin.
Claim 7
Dependent Claim
16 words
The device according to claim 4 and: a. an electrolyte between the cathode and the anode.
Claim 8
Dependent Claim
17 words
The device according to claim 4 and an electrically conductive contact between the jacket and the anode.
Claim 9
Dependent Claim
44 words
The device according to claim 1 and: a. an ionically permeable, low resistance, high wet strength separator surrounding the cathode, b. an anode comprising a cylinder of amalgamated zinc surrounding the cathode, c. an electrolyte in the separator between the anode and the cathode.
References Cited (Backward Citations)
US793077A
Cited
US2234732A
Cited
US2480839A
Cited
US3060254A
Cited
US3305401A
Cited
US3262815A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |