US5017445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dry cell
Assignee: Panasonic Holdings Corp
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Filing: 1989-12-06
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Granted: 1991-05-21
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Expires: 2009-12-06
Abstract
Abstract A dry cell comprising an anode made of zinc and cathode mixture which includes manganese dioxide acting as active agent and conductor such that acetylene black having a specific surface area of 100 to 150 m 2 /g measured by a BET type nitrogen gas adsorption method is used as the conductor by setting a mixing ratio in weight of the manganese dioxide to the acetylene black at 7/1 to 12/1.
Inventors
- 👤 Ryohei Ashihara
- 👤 Kikumitsu Suehiro
- 👤 Kazuo Sugino
- 👤 Jun Miyoshi
- 👤 Masatsugu Eri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:40
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/04; H01M6/06; H01M4/00; H01M4/02; H01M4/62; H01M4/624; H01M4/625; H01M4/06; H01M4/08; H01M4/36; H01M4/48; H01M4/50
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
74 words
In a dry cell comprising an anode made of zinc and cathode mixture which includes manganese dioxide acting as active agent and conductor, the improvement comprising: acetylene black having a specific surface area of 110 to 150 m 2 /g measured by a BET type nitrogen gas adsorption method, which is used as the conductor; and a mixing ratio in weight of the manganese dioxide to the acetylene black ranging from 7/1 to 12/1.
Claim 2
Dependent Claim
74 words
In a dry cell comprising an anode made of zinc and cathode mixture which includes manganese dioxide acting as active agent and conductor, the improvement comprising: acetylene black having a specific surface area of 110 to 150 m 2 /g measured by a BET type nitrogen gas adsorption method, which is used as the conductor; and a mixing ratio in weight of the manganese dioxide to the acetylene black ranging from 7/1 to 12/1.
Claim 3
Dependent Claim
45 words
A dry cell as claimed in claim 1, wherein said cathode mixture includes 100 parts by weight of a mixture of the manganese dioxide and the acetylene black and 36-90 parts by weight of electrolyte, the electrolyte consisting of zinc chloride ammonium chloride and water.
Claim 4
Dependent Claim
27 words
A dry cell as claimed in claim 2, wherein the electrolyte contains 25-32.5 wt. % of the zinc chloride and 1.5-4.0 wt. % of the ammonium chloride.
Claim 5
Dependent Claim
137 words
A dry cell comprising: a zinc can which acts as an anode; a cathode mixture; and a separation paper which is provided, on its one face adjacent to said zinc can, with a paste layer; said cathode mixture including manganese dioxide acting as active agent, acetylene black and electrolyte such that a mixing ratio in weight of the manganese dioxide to the acetylene black ranges from 7/1 to 10/1; said cathode mixture including 100 parts by weight of a mixture of the manganese dioxide and the acetylene black and 60-80 parts by weight of the electrolyte; the acetylene black having a specific surface area of 110 to 145 m 2 /g measured by a BET type nitrogen gas adsorption method; the electrolyte containing 30 wt. % of zinc chloride, 1.5-1.9 wt. % of ammonium chloride and water.
Claim 6
Dependent Claim
137 words
A dry cell comprising: a zinc can which acts as an anode; a cathode mixture; and a separation paper which is provided, on its one face adjacent to said zinc can, with a paste layer; said cathode mixture including manganese dioxide acting as active agent, acetylene black and electrolyte such that a mixing ratio in weight of the manganese dioxide to the acetylene black ranges from 7/1 to 10/1; said cathode mixture including 100 parts by weight of a mixture of the manganese dioxide and the acetylene black and 60-80 parts by weight of the electrolyte; the acetylene black having a specific surface area of 110 to 145 m 2 /g measured by a BET type nitrogen gas adsorption method; the electrolyte containing 30 wt. % of zinc chloride, 1.5-1.9 wt. % of ammonium chloride and water.
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) | 1994-05-20 | 1994-11-19 | 1995-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-20 | 1998-11-19 | 1999-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-20 | 2002-11-19 | 2003-05-21 | $7700.00 | Window Closed / Lapsed |