Patent US3972739A successfully refreshed from Google Patents.
US3972739A
Expired / Lapsed
US
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Rechargeable battery with current limiting means
Assignee: Gates Corp
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Filing: 1975-11-28
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Granted: 1976-08-03
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Expires: 1995-11-28
Abstract
Abstract A battery and enclosure such as a rechargeable lantern battery housing a self-contained battery, and a recharge jack mounted in the enclosure, includes a low resistance, high power current-limiting means connected between one of the output terminals and the corresponding polarity terminal of the battery and which is provided with heat indicating means for determining if the output terminals of the battery have been short-circuited.
Inventors
- 👤 Ronald O. Hammel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:20
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/50; H01M6/5044; H01M6/505; H01M10/00; H01M10/42; H01M2200/00; H01M2200/10; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
119 words
In a rechargeable battery having an enclosure, a self-contained battery or plurality of self-contained electrochemical cells disposed in the enclosure and having first and second terminals, output terminals mounted exteriorly on the enclosure, and a recharge jack mounted exteriorly on the enclosure and having leads connected to the first and second terminals of the battery, the improvement comprising: a low resistance, high power current-limiting means connected between one of the output terminals and the corresponding polarity first or second terminal of the battery; heat indicating means in close proximity or directly affixed to the current-limiting means for indicating whether a threshold level of current corresponding to a short-circuit across the output terminals had been carried by the current-limiting means.
Claim 2
Dependent Claim
119 words
In a rechargeable battery having an enclosure, a self-contained battery or plurality of self-contained electrochemical cells disposed in the enclosure and having first and second terminals, output terminals mounted exteriorly on the enclosure, and a recharge jack mounted exteriorly on the enclosure and having leads connected to the first and second terminals of the battery, the improvement comprising: a low resistance, high power current-limiting means connected between one of the output terminals and the corresponding polarity first or second terminal of the battery; heat indicating means in close proximity or directly affixed to the current-limiting means for indicating whether a threshold level of current corresponding to a short-circuit across the output terminals had been carried by the current-limiting means.
Claim 3
Dependent Claim
45 words
The rechargeable battery of claim 1 wherein the current-limiting means is connected between one of the output terminals and one side of the recharge jack so that the current-limiting means conducts during discharging of the battery and does not conduct during recharging of the battery.
Claim 4
Dependent Claim
13 words
The rechargeable battery of claim 1 wherein the current-limiting means is a resistor.
Claim 5
Dependent Claim
37 words
The rechargeable battery of claim 1 wherein the heat indicating means is a mass of heat sensitive paint or crayon which undergoes a visual transformation when the threshold level of current is conducted by the current-limiting means.
References Cited (Backward Citations)
US3233092A
Cited
US3907588A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-03 | 1980-02-02 | 1980-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-03 | 1984-02-02 | 1984-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-03 | 1988-02-02 | 1988-08-03 | $7700.00 | Window Closed / Lapsed |