US3234538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Battery condition indicator
Assignee: Marine Electric Corp
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Filing: 1961-11-30
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Granted: 1966-02-08
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Expires: 1981-11-30
Abstract
No abstract record available.
Inventors
- 👤 Harry G Parke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:05
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/36; G01R31/389
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
A BATTERY CONDITION INDICATOR COMPRISING A SOURCE OF ALTERNATION VOLTAGE CONNECTED TO THE PRIMARY OF A TRANSFORMER TO EXCITE THE LATTER, A BATTERY FOR AN EMERGENCY LOAD CIRCUIT AND WHOSE CONDITION IS TO BE TESTED CONNECTED IN SERIES WITH THE SECONDARY OF SAID TRANSFORMER, MEANS TO PREVENT FLOW OF D.C. CURRENT CONNECTED IN SERIES WITH THE TRANSFORMER SECONDARY AND SAID BATTERY, AND SIGNALING MEANS IN SERIES WITH THE PRIMARY OF THE TRANSFROMER FOR INDICATING THAT THE INTERNAL RESISTANCE OF SAID BATTERY HAS RISEN BEYOND A PRESELECTED VALUE.
Claim 2
Dependent Claim
87 words
A BATTERY CONDITION INDICATOR COMPRISING A SOURCE OF ALTERNATION VOLTAGE CONNECTED TO THE PRIMARY OF A TRANSFORMER TO EXCITE THE LATTER, A BATTERY FOR AN EMERGENCY LOAD CIRCUIT AND WHOSE CONDITION IS TO BE TESTED CONNECTED IN SERIES WITH THE SECONDARY OF SAID TRANSFORMER, MEANS TO PREVENT FLOW OF D.C. CURRENT CONNECTED IN SERIES WITH THE TRANSFORMER SECONDARY AND SAID BATTERY, AND SIGNALING MEANS IN SERIES WITH THE PRIMARY OF THE TRANSFROMER FOR INDICATING THAT THE INTERNAL RESISTANCE OF SAID BATTERY HAS RISEN BEYOND A PRESELECTED VALUE.
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) | 1969-02-07 | 1969-08-09 | 1970-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-07 | 1973-08-09 | 1974-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-07 | 1977-08-09 | 1978-02-08 | $7700.00 | Window Closed / Lapsed |