Patent US3556699A successfully refreshed from Google Patents.
US3556699A
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US
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Discharge ignition type photoflash lamp
Assignee: Toshiba Corp
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Filing: 1969-01-28
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Granted: 1971-01-19
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Expires: 1989-01-28
Abstract
Abstract A PHOTOFLASH LAMP OF THE DISCHARGE IGNITION TYPE IS PROVIDED WITH A PAIR OF DISCHARGE ELECTRODES, AT LEAST ONE OF WHICH IS COVERED AT ITS INNER END WITH A PRIMER MATERIAL OF HIGH ELECTRICAL RESISTANCE. BETWEEN THE ELECTRODES IS FORMED A GAP RANGING FROM 0.05 TO 0.8 MM., WHICH IS FILLED WITH A COMBUSTION-SUPPORTING GAS. A HIGH VOLTAGE PULSE IS IMPRESSED UPON THE ELECTRODES TO DIELECTRICALLY BREAK-DOWN THE COMBUSTION-SUPPORTING GAS AS WELL AS THE PRIMER, THEREBY TO IGNITE SAID PRIMER.
Inventors
- 👤 Koichi Takahashi
- 👤 Hidehiro Shinada
- 👤 Hisashi Ishii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:48
CPC Classifications
G; G03; G03B; G03B15/00; G03B15/02; G03B15/03; G03B15/04; G03B15/0452; G03B15/0457; F; F21; F21K; F21K5/00; F21K5/02
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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |