US3247442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Battery chargers
Assignee: Fox Products Co
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Filing: 1961-12-04
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Granted: 1966-04-19
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Expires: 1981-12-04
Abstract
No abstract record available.
Inventors
- 👤 Lewis A Medlar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:15
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/90; H02J7/96; H02J7/02; H02J7/04; H02J7/12; Y; Y10; Y10S; Y10S320/00; Y10S320/22; Y10S320/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A CONTROL CIRCUIT FOR ACCOMPLISHING AN ON-OFF CONTROL FUNCTION IN RESPONSE TO VARIATION OF A REFERENCE VOLTAGE, THE COMBINATION OF A FIRST CIRCUIT TO BE CONNECTED ACROSS A SOURCE OF VARYING VOLTAGE; A VOLTAGE DIVIDER CONNECTED ACROSS SAID FIRST CIRCUIT AND HAVING AN OUTPUT TERMINAL; FIRST AND SECOND TRANSISTORS EACH INCLUDING AN EMITTER, A BASE AND A COLLECTOR, THE EMITTER AND COLLECTOR OF BOTH OF SAID TRANSISTORS BEING CONNECTED ACROSS SAID FIRST CIRCUIT, THE BASE OF SAID FIRST TRANSISTOR BEING CONNECTED TO THE COLLECTOR OF SAID SECOND TRANSISTOR; A SEMICONDUCTOR DIODE, THE BASE OF SAID SECOND TRANSISTOR BEING CONNECTED TO SAID VOLTAGE DIVIDER OUTPUT TERMINAL VIA SAID DIODE, AND FEEDBACK CIRCUIT MEANS CONNECTING THE COLLECTOR OF SAID FIRST TRANSISTOR TO A POINT ON SAID VOLTAGE DIVIDER SPACED ELECTRICALLY FROM SAID OUTPUT TERMINAL.
Claim 2
Dependent Claim
132 words
A CONTROL CIRCUIT FOR ACCOMPLISHING AN ON-OFF CONTROL FUNCTION IN RESPONSE TO VARIATION OF A REFERENCE VOLTAGE, THE COMBINATION OF A FIRST CIRCUIT TO BE CONNECTED ACROSS A SOURCE OF VARYING VOLTAGE; A VOLTAGE DIVIDER CONNECTED ACROSS SAID FIRST CIRCUIT AND HAVING AN OUTPUT TERMINAL; FIRST AND SECOND TRANSISTORS EACH INCLUDING AN EMITTER, A BASE AND A COLLECTOR, THE EMITTER AND COLLECTOR OF BOTH OF SAID TRANSISTORS BEING CONNECTED ACROSS SAID FIRST CIRCUIT, THE BASE OF SAID FIRST TRANSISTOR BEING CONNECTED TO THE COLLECTOR OF SAID SECOND TRANSISTOR; A SEMICONDUCTOR DIODE, THE BASE OF SAID SECOND TRANSISTOR BEING CONNECTED TO SAID VOLTAGE DIVIDER OUTPUT TERMINAL VIA SAID DIODE, AND FEEDBACK CIRCUIT MEANS CONNECTING THE COLLECTOR OF SAID FIRST TRANSISTOR TO A POINT ON SAID VOLTAGE DIVIDER SPACED ELECTRICALLY FROM SAID OUTPUT TERMINAL.
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) | 1969-04-18 | 1969-10-18 | 1970-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-18 | 1973-10-18 | 1974-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-18 | 1977-10-18 | 1978-04-19 | $7700.00 | Window Closed / Lapsed |