US3555394A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power pack for photographic flashlamp
Assignee: Graflex Inc
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Filing: 1968-08-02
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Granted: 1971-01-12
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Expires: 1988-08-02
Abstract
Abstract A POWER PACK FOR A PHOTOGRAPHIC FLASHLAMP HAVING A STORAGE CAPACITOR INCLUDES A BATTERY AND CONTROL CIRCUITRY IN SEPARABLE PORTIONS OF THE CASE WITH THE BATTERY CONTACTS ARRANGED SO THAT WHEN THE CASE IS OPENED THE BATTERY IS FIRST DISCONNECTED FROM THE CONTROL CIRCUIT AND THEN A NORMALLY OPEN SWITCH IS CLOSED TO CONNECT A RESISTOR ACROSS THE CAPACITOR TO DISCHARGE IT. THE POWER PACK ALSO INCLUDES AN "ON" INDICATOR LAMP FLASHED BY A RELAXATION OSCILLATOR AND MECHANICAL STRENGTH AND CONVENIENCE FEATURES IN THE CASE.
Inventors
- 👤 Donald W Bramer
- 👤 Paul P Clocksin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:41
CPC Classifications
G; G03; G03B; G03B15/00; G03B15/02; G03B15/03; G03B15/05; G03B2215/00; G03B2215/05; G03B2215/0514; G03B2215/0517
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |