US3553665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable hydrogen flame detector
Assignee: United States Department of the Air Force
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Filing: 1967-03-03
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Granted: 1971-01-05
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Expires: 1987-03-03
Abstract
Abstract A PORTABLE HYDROGEN FLAME DETECTOR FOR USE IN A HYDROGEN STORAGE AREA TO DETECT SMALL HYDROGEN FLAMES. THE DETECTOR UTILIZES AN ULTRAVIOLET TUBE WHICH BECOMES IONIZED IN THE PRESENCE OF ULTRAVIOLET RADIATION EMITTED FROM A HYDROGEN FLAME. A CHARGING CIRCUIT OPERATES IN CONJUNCTION WITH THE TUBE TO PROVIDE A SERIES OF PULSES DURING EACH PERIOD THAT THE ULTRAVIOLET TUBE IS IONIZED. THESE PLUSES ARE FED INTO A VISULA READOUT CIRCUIT THAT CAUSE A NEON INDICATOR TO BLINK ON AND OFF, AND INTO AN AUDIO READOUT CIRCUIT THAT CAUSE A SERIES OF TONE BUST IN A SET OF HEAD PHONES.
Inventors
- 👤 Terry M Trumble
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:00
CPC Classifications
G; G08; G08B; G08B17/00; G08B17/12
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |