US3241029A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable lighting unit
Assignee: General Electric Co
•
Filing: 1962-09-24
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Granted: 1966-03-15
•
Expires: 1982-09-24
Abstract
No abstract record available.
Inventors
- 👤 Stanley L Slomski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:11
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/90; H02J7/96
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
168 words
A PORTABLE LIGHTING UNIT COMPRISING AN INCANDESCENT LIGHT SOURCE CONNECTED TO A RECHARGEABLE STORAGE BATTERY THROUGH ONE TERMINAL OF A TWO-TERMINAL SWITCH; MEANS FOR PROVIDING A CHARGING CURRENT TO SAID BATTERY THROUGH THE OTHER TERMINAL OF SAID SWITCH; AND A CONTROL CIRCUIT FOR SHUTTING OFF THE CHARGING CURRENT TO THE BATTERY WHEN SAID BATTERY HAS ACCUMULATED A PREDETERMINED VOLTAGE COMPRISING A RELAY HAVING A COIL, NORMALLY CLOSED CONTACTS CONNECTING THE BATTERY TO THE CHARGING CURRENT MEANS AND NORMALLY OPEN CONTACTS FORMING A HOLDING CIRCUIT FOR THE RELAY COIL; AND MEANS FOR ACTUATING SAID RELAY IN RESPONSE TO THE PREDETERMINED BATTERY VOLTAGE INCLUDING A CONSTANT VOLTAGE REFERENCE CIRCUIT HAVING A ZENER DIODE AND SUFFICIENT RESISTANCE TO RENDER SAID DIODE CONDUCTIVE, A VOLTAGE SAMPLING CIRCUIT, AND A TRANSISTOR HAVING ITS BASE CONNECTED TO THE VOLTAGE SAMPLING CIRCUIT AND ITS EMITTER CONNECTED TO THE CONSTANT VOLTAGE REFERENCE CIRCUIT, THE RESISTANCE OF THE VOLTAGE SAMPLING CIRCUIT BEING SET SO THAT THE TRANSISTOR IS RENDERED CONDUCTIVE WHEN THE BATTERY REACHES THE PREDETERMINED VOLTAGE.
Claim 2
Dependent Claim
168 words
A PORTABLE LIGHTING UNIT COMPRISING AN INCANDESCENT LIGHT SOURCE CONNECTED TO A RECHARGEABLE STORAGE BATTERY THROUGH ONE TERMINAL OF A TWO-TERMINAL SWITCH; MEANS FOR PROVIDING A CHARGING CURRENT TO SAID BATTERY THROUGH THE OTHER TERMINAL OF SAID SWITCH; AND A CONTROL CIRCUIT FOR SHUTTING OFF THE CHARGING CURRENT TO THE BATTERY WHEN SAID BATTERY HAS ACCUMULATED A PREDETERMINED VOLTAGE COMPRISING A RELAY HAVING A COIL, NORMALLY CLOSED CONTACTS CONNECTING THE BATTERY TO THE CHARGING CURRENT MEANS AND NORMALLY OPEN CONTACTS FORMING A HOLDING CIRCUIT FOR THE RELAY COIL; AND MEANS FOR ACTUATING SAID RELAY IN RESPONSE TO THE PREDETERMINED BATTERY VOLTAGE INCLUDING A CONSTANT VOLTAGE REFERENCE CIRCUIT HAVING A ZENER DIODE AND SUFFICIENT RESISTANCE TO RENDER SAID DIODE CONDUCTIVE, A VOLTAGE SAMPLING CIRCUIT, AND A TRANSISTOR HAVING ITS BASE CONNECTED TO THE VOLTAGE SAMPLING CIRCUIT AND ITS EMITTER CONNECTED TO THE CONSTANT VOLTAGE REFERENCE CIRCUIT, THE RESISTANCE OF THE VOLTAGE SAMPLING CIRCUIT BEING SET SO THAT THE TRANSISTOR IS RENDERED CONDUCTIVE WHEN THE BATTERY REACHES THE PREDETERMINED VOLTAGE.
References Cited (Backward Citations)
US1964201A
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US2277578A
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US2628339A
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US2751545A
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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) | 1969-03-14 | 1969-09-13 | 1970-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-14 | 1973-09-13 | 1974-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-14 | 1977-09-13 | 1978-03-15 | $7700.00 | Window Closed / Lapsed |