US3221239A
Expired / Lapsed
US
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Transistors as anti-reversal devices for series connected rechargeable cells
Assignee: Duracell Inc USA
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Filing: 1963-05-13
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Granted: 1965-11-30
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Expires: 1983-05-13
Abstract
No abstract record available.
Inventors
- 👤 Langer Nicholas
- 👤 Mallory Henry Rogers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:39
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/42; H01M10/4207; H02; H02J; H02J7/00; H02J7/50; H02J7/52; H02J7/54; H02J7/60; H02J7/63; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
113 words
A BATTERY COMPRISING A PLURALITY OF RECHARGEABLE CELLS CONNECTED IN SERIES, EACH OF SAID CELLS HAVING A POSITIVE AND A NEGATIVE TERMINAL, A TRANSISTOR OF THE PNP TYPE FOR EACH OF SAID CELLS HAVING A BASE, AN EMITTER AND A COLLECTOR, SAID EMITTER AND COLLECTOR BEING RESPECTIVELY CONNECTED TO SAID POSITIVE AND SAID NEGATIVE TERMINALS OF THE CORRESPONDING CELL AND SAID BASE BEING DIRECTLY CONNECTED TO SAID EMITTER MAINTAINING THE EMITTER TO COLLECTOR RESISTANCE AT A VERY HIGH VALUE DURING NORMAL DISCHARGE OF THE SAID CELL AND CAUSING THE EMITTER TO COLLECTOR RESISTANCE TO DROP TO A VERY LOW VALUE UPON EXCESSIVE DISCHARGE AND POLARITY REVERSAL OF SAID CELL THEREBY BY-PASSING SAID CELL.
References Cited (Backward Citations)
US3085187A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |