Percussively ignitable flashbulbs having means for determining the condition thereof
Abstract
Abstract THE METALLIC IGNITION MEMBER OF A PERCUSSIVELY IGNITABLE FLASHBULB IS COATED WITH AN INSULATING MATERIAL WHICH MELTS, BURNS, VAPORIZES OR BECOMES CONDUCTIVE UNDER THE INFLUENCE OF THE HEAT PRODUCED WHEN THE FLASHBULB IS IGNITED. A PAIR OF SPACED ELECTRICAL CONTACT MEMBERS ARE ADAPTED TO ENGAGE THE COATED IGNITION MEMBER TO PROVIDE A SWITCH IN SERIES WITH A SIGNAL LAMP OR THE LIKE. IF THE BULB HAS NOT BEEN FIRED, THE CONTACT MEMBERS ARE INSULATED FROM THE METALLIC IGNITION MEMBER BY THE COATING MATERIAL SO THAT THE SWITCH REMAINS IN AN OPEN CONDITION. AFTER THE BULB IS FIRED, THE FINGERS ARE SHORTED BY THE METALLIC IGNITION MEMBER TO CLOSE THE SWITCH AND THEREBY ENERGIZE THE SIGNAL LAMP.
Inventors
- 👤 Donald M Harvey
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |