Patent US3305755A successfully refreshed from Google Patents.
US3305755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual control battery charger
Assignee: All American Engineering Co
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Filing: 1964-04-24
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Granted: 1967-02-21
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Expires: 1984-04-24
Abstract
No abstract record available.
Inventors
- 👤 Robert R Walsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:31
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/02; H02J2207/00; H02J2207/20; Y; Y10; Y10S; Y10S320/00; Y10S320/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
CHARGING MEANS FOR DELIVERING CHARGING CURRENT TO A LOAD, SAID LOAD HAVING A PREDETERMINED MINIMUM TERMINAL VOLTAGE AND A PREDETERMINED MAXIMUM TERMINAL VOLTAGE, SAID CHARGING MEANS COMPRISING A POWER SOURCE, CIRCUIT MEANS CONNECTED WITH SAID POWER SOURCE DERIVING FIRST AND SECOND VOLTAGE STANDARDS THEREFROM EQUAL TO SAID PREDETERMINED MINIMUM AND MAXIMUM TERMINAL VOLTAGES, RESPECTIVELY, FIRST AND SECOND SEMICONDUCTOR SWITCH MEANS CONNECTED IN SERIES WITH SAID POWER SOURCE AND SAID LOAD, SAID FIRST AND SECOND SWITCH MEANS INCLUDING FIRST AND SECOND GATE TERMINALS, RESPECTIVELY, CONDUCTOR MEANS APPLYING SAID SECOND VOLTAGE STANDARD TO SAID FIRST GATE TERMINAL AND SAID FIRST VOLTAGE STANDARD TO SAID SECOND GATE TERMINAL AND CAPACITANCE LOAD MEANS CONNECTED IN SERIES WITH SAID FIRST SEMICONDUCTOR SWITCH MEANS AND IN PARALLEL WITH SAID LOAD.
Claim 2
Dependent Claim
124 words
CHARGING MEANS FOR DELIVERING CHARGING CURRENT TO A LOAD, SAID LOAD HAVING A PREDETERMINED MINIMUM TERMINAL VOLTAGE AND A PREDETERMINED MAXIMUM TERMINAL VOLTAGE, SAID CHARGING MEANS COMPRISING A POWER SOURCE, CIRCUIT MEANS CONNECTED WITH SAID POWER SOURCE DERIVING FIRST AND SECOND VOLTAGE STANDARDS THEREFROM EQUAL TO SAID PREDETERMINED MINIMUM AND MAXIMUM TERMINAL VOLTAGES, RESPECTIVELY, FIRST AND SECOND SEMICONDUCTOR SWITCH MEANS CONNECTED IN SERIES WITH SAID POWER SOURCE AND SAID LOAD, SAID FIRST AND SECOND SWITCH MEANS INCLUDING FIRST AND SECOND GATE TERMINALS, RESPECTIVELY, CONDUCTOR MEANS APPLYING SAID SECOND VOLTAGE STANDARD TO SAID FIRST GATE TERMINAL AND SAID FIRST VOLTAGE STANDARD TO SAID SECOND GATE TERMINAL AND CAPACITANCE LOAD MEANS CONNECTED IN SERIES WITH SAID FIRST SEMICONDUCTOR SWITCH MEANS AND IN PARALLEL WITH SAID LOAD.
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) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |