US3692408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Energizing circuit for a duplicating machine
Assignee: Minolta Co Ltd
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Filing: 1970-12-11
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Granted: 1972-09-19
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Expires: 1990-12-11
Abstract
Abstract Circuits for controlling the energization of a lamp and a heater in a copying machine include rectifiers for conducting respective half cycles of an AC power source to the lamp and the heater. Control is also provided for varying the instant which the heater and lamp are energized in each respective half cycle so as to vary the amount of current to each device. Additionally, the circuitry provides for pre-heating of the lamp and heater in order to preserve the life of the lamp and to reduce the time for the heater to attain its necessary temperature.
Inventors
- 👤 Kitamaro Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:22
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/02; G03B27/14; G03B27/16; G03G; G03G15/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
108 words
A circuit for energizing at least one lamp and at least one heater from an AC power source in a copying machine, comprising: first and second unidirectional conductive switch means connected to conduct current from respective half cycles from said AC power source, said first unidirectional conductive means connecting said AC power source with said at least one lamp and said second unidirectional conductive means connecting said AC power source to said at least one heater; means for controlling the excitation of said first and second unidirectional conductive means; and means for switching said first and second unidirectional conductive means to be activated by said means for controlling.
Claim 2
Dependent Claim
108 words
A circuit for energizing at least one lamp and at least one heater from an AC power source in a copying machine, comprising: first and second unidirectional conductive switch means connected to conduct current from respective half cycles from said AC power source, said first unidirectional conductive means connecting said AC power source with said at least one lamp and said second unidirectional conductive means connecting said AC power source to said at least one heater; means for controlling the excitation of said first and second unidirectional conductive means; and means for switching said first and second unidirectional conductive means to be activated by said means for controlling.
Claim 3
Dependent Claim
85 words
A circuit as in claim 1 wherein said means for switching may be positioned to independently energize said at least one heater or said at least one lamp, said means for switching is positioned to simultaneously fully energize said at least one lamp and said at least one heater, and said means for switching further includes means for varying the instant of energization of said at least one lamp and said at least one heater during a respective half cycle of said AC power source.
Claim 4
Dependent Claim
76 words
A circuit as in claim 1 wherein said first and second unidirectional conductive switch means are serially connected across said AC power source; said at least one heater and said at least one lamp are serially connected across said AC power source, and said means for switching comprises first and second ganged two-position switches wherein a first position actuates said first unidirectional conductive switch means and a second position actuates said second unidirectional conductive switch means.
Claim 5
Dependent Claim
98 words
A circuit as in claim 2 wherein said first unidirectional conductive switch means is serially connected with said at least one lamp across said AC power source, said second unidirectional conductive switch means is serially connected with said at least one heater across said AC power source, said switch means comprises first and second switches for respectively energizing said first and second unidirectional conductive switch means and said means for varying the instant of actuation of said first and second unidirectional conductive switch means comprises first and second variable resistors respectively connected to said first and second switches.
References Cited (Backward Citations)
US3148610A
Cited
US3288047A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |