US4247607A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lithium halide primary cell having end of life indicator means
Assignee: MSA Safety Inc
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Filing: 1980-04-28
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Granted: 1981-01-27
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Expires: 2000-04-28
Abstract
Abstract The present invention relates to a lithium halide primary cell having means to indicate its end of life. The cell includes at least one lithium anode and a cathode in contact with a major surface of the anode wherein the indicating means comprises a stepped portion on the major surface of said anode which is not in contact with the cathode. The stepped portion of the anode comprises a surface area of from about 40 to 60% of the area of the major surface in contact with the cathode and about 15 to 5% of the total thickness of said anode.
Inventors
- 👤 Matthew O'Boyle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:39
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/50; H01M6/14; H01M6/18; H01M6/182; H01M6/5044; H01M2200/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
103 words
A lithium halide primary cell comprising an encasement member; at least one lithium anode positioned within and in contact with said encasement member, said anode having two major surfaces one of which is adapted to be in contact with a cathode, said other major surface having a stepped portion comprising from 15 to 5% of the total thickness of said anode and from 40 to 60% of the area of said major surface; a cathode positioned in contact with said major surface of said anode but not in electrical contact with said encasement means; and a terminal in electrical contact with said cathode.
Claim 2
Dependent Claim
103 words
A lithium halide primary cell comprising an encasement member; at least one lithium anode positioned within and in contact with said encasement member, said anode having two major surfaces one of which is adapted to be in contact with a cathode, said other major surface having a stepped portion comprising from 15 to 5% of the total thickness of said anode and from 40 to 60% of the area of said major surface; a cathode positioned in contact with said major surface of said anode but not in electrical contact with said encasement means; and a terminal in electrical contact with said cathode.
Claim 3
Dependent Claim
20 words
A lithium halide primary cell as set forth in claim 1 wherein said cell comprises first and second lithium anodes.
Claim 4
Dependent Claim
32 words
A lithium halide primary cell has set forth in claims 1 or 2 wherein said stepped portion comprises 10% of the total thickness of the associated anode and 50% of said surface.
Claim 5
Dependent Claim
24 words
A lithium halide primary cell as set forth in claims 1 or 2 wherein said lithium anode is in the form of a disc.
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) | 1984-01-27 | 1984-07-28 | 1985-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-27 | 1988-07-28 | 1989-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-27 | 1992-07-28 | 1993-01-27 | $7700.00 | Window Closed / Lapsed |