US3757793A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrochemical cell with stepped voltage output
Assignee: Medtronic Inc
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Filing: 1971-11-15
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Granted: 1973-09-11
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Expires: 1991-11-15
Abstract
Abstract An electrochemical cell is provided having a stepped voltage output during its lifetime due to multiple composition anode and cathode construction. The stepped output voltage provides a beginning of life (BOL) voltage indication, a voltage output indicative of the main capacity of the cell, and an end of life (EOL) output voltage indication warning the user that the total battery capacity is nearly exhausted.
Inventors
- 👤 K Fester
- 👤 R Doty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:26
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/36; H01M4/362; H01M4/364; A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/372; A61N1/378; H01M10/00; H01M10/24; H01M6/00; H01M6/50; H01M6/5044; H01M6/5055; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
120 words
In combination an electrical circuit defining a medical cardiac pacer and an electrolytic cell as a power source therefor, said cell comprising a casing, an anode and a cathode and an alkaline electrolyte positioned within said casing, lead means connecting said cell anode and cathode to said pacer electrical circuit, said anode and said cathode having a plurality of electrochemically active materials defining with said electrolyte first, second and third electrolytic couples, said first couple having a higher Eo than said second couple and said second couple having a higher Eo than said third couple, the first and third of said couples each comprising from about 1 to about 15 percent of the total ampere hour capacity of the cell.
Claim 2
Dependent Claim
120 words
In combination an electrical circuit defining a medical cardiac pacer and an electrolytic cell as a power source therefor, said cell comprising a casing, an anode and a cathode and an alkaline electrolyte positioned within said casing, lead means connecting said cell anode and cathode to said pacer electrical circuit, said anode and said cathode having a plurality of electrochemically active materials defining with said electrolyte first, second and third electrolytic couples, said first couple having a higher Eo than said second couple and said second couple having a higher Eo than said third couple, the first and third of said couples each comprising from about 1 to about 15 percent of the total ampere hour capacity of the cell.
Claim 3
Dependent Claim
28 words
A combination in accordance with claim 1 wherein said electrical circuit includes test terminals for determining the voltage output and thus the state of charge of said cell.
Claim 4
Dependent Claim
36 words
The combination in accordance with claim 1 wherein the electrochemically active material of said anode is zinc and the electroChemically active material of said cathode is a mixture of silver peroxide, silver oxide and mercuric oxide.
Claim 5
Dependent Claim
36 words
The combination in accordance with claim 1 wherein the electrochemically active materials of said anode are zinc and cadmium and the electrochemically active material of said anode is a mixture of silver peroxide and silver oxide.
References Cited (Backward Citations)
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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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |