US3344704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Illumination control
Assignee: Individual
•
Filing: 1964-09-24
•
Granted: 1967-10-03
•
Expires: 1984-09-24
Abstract
No abstract record available.
Inventors
- 👤 Simpson Lewis Edward
- 👤 Karow William Eugene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:30
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/72
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
149 words
AN EXPOSURE CONTROL ARRANGEMENT FOR AN ELECTRICALLY POWERED ILLUMINATING SOURCE COMPRISING: CAPACITOR MEANS CONNECTABLE TO A CHARGING VOLTAGE SUBSTANTIALLY PROPORTIONAL TO THE VOLTAGE SUPPLIED TO SAID ILLUMINATING SOURCE; SWITCHING MEANS CONNECTED TO SAID CAPACITOR FOR DISCHARGING SAID CAPACITOR WHEN THE VOLTAGE THEREACROSS REACHES A PREDETERMINED SWITCHING VALUE; AND EXPOSURE CONTROL MEANS CONNECTED TO SAID SWITCHING MEANS AND TO SAID CAPACITOR TO INITIATE AN EXPOSURE AT APPROXIMATELY THE SAME TIME THAT SAID CAPACITOR MEANS BEGINS TO CHARGE, AND FOR TERMINATING THE EXPOSURE AT APPROXIMATELY THE SAME TIME THAT SAID CAPACITOR IS DISCHARGED, SAID SWITCHING MEANS COMPRISING A UNIJUNCTION TRANSISTOR MEANS HAVING TWO BASES AND AN EMITTER, AND FURTHER INCLUDING A ZENER DIODE MEANS CONNECTED ACROSS SAID BASE, AND WHEREIN SAID CAPACITOR IS CONNECTED ACROSS SAID EMITTER AND ONE OF SAID BASES, WHEREBY THE EXPOSURE PERIOD DECREASES OR INCREASES WITH THE INCREASE OR DECREASE, RESPECTIVELY, OF VOLTAGE ACROSS SAID ILLUMINATING SOURCE.
Claim 2
Dependent Claim
149 words
AN EXPOSURE CONTROL ARRANGEMENT FOR AN ELECTRICALLY POWERED ILLUMINATING SOURCE COMPRISING: CAPACITOR MEANS CONNECTABLE TO A CHARGING VOLTAGE SUBSTANTIALLY PROPORTIONAL TO THE VOLTAGE SUPPLIED TO SAID ILLUMINATING SOURCE; SWITCHING MEANS CONNECTED TO SAID CAPACITOR FOR DISCHARGING SAID CAPACITOR WHEN THE VOLTAGE THEREACROSS REACHES A PREDETERMINED SWITCHING VALUE; AND EXPOSURE CONTROL MEANS CONNECTED TO SAID SWITCHING MEANS AND TO SAID CAPACITOR TO INITIATE AN EXPOSURE AT APPROXIMATELY THE SAME TIME THAT SAID CAPACITOR MEANS BEGINS TO CHARGE, AND FOR TERMINATING THE EXPOSURE AT APPROXIMATELY THE SAME TIME THAT SAID CAPACITOR IS DISCHARGED, SAID SWITCHING MEANS COMPRISING A UNIJUNCTION TRANSISTOR MEANS HAVING TWO BASES AND AN EMITTER, AND FURTHER INCLUDING A ZENER DIODE MEANS CONNECTED ACROSS SAID BASE, AND WHEREIN SAID CAPACITOR IS CONNECTED ACROSS SAID EMITTER AND ONE OF SAID BASES, WHEREBY THE EXPOSURE PERIOD DECREASES OR INCREASES WITH THE INCREASE OR DECREASE, RESPECTIVELY, OF VOLTAGE ACROSS SAID ILLUMINATING SOURCE.
References Cited (Backward Citations)
US3262356A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-02 | 1971-04-03 | 1971-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-02 | 1975-04-03 | 1975-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-02 | 1979-04-03 | 1979-10-03 | $7700.00 | Window Closed / Lapsed |