US3672814A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoflash lamp with yttrium combustion filling
Assignee: Philips North America LLC
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Filing: 1970-10-30
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Granted: 1972-06-27
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Expires: 1990-10-30
Abstract
Abstract AN IMPROVED COMBUSTIBLE PHOTOFLASH LAMP IS DESCRIBED WHEREIN THE COMBUSTIBLE METAL FOIL IS YTTRIUM METAL. THE RISE TIME CHARACTERISTIC TO PEAK LIGHT OUTPUT IS SIGNIFICANTLY IMPROVED BY THE USE OF THE YTTRIUM COMBUSTIBLE METAL. THE ADDITION OF VARYING AMOUNTS OF YTTRIUM METAL TO STANDARD COMBUSTIBLE METAL SUCH AS ZIRCONIUM ALSO IMPROVES THE RISE TIME TO PEAK LIGHT OUTPUT CHARACTERISTIC FOR THESE LAMPS.
Inventors
- 👤 Kenneth F Andrew
- 👤 Richard L Tallman
- 👤 Earl A Gulbransen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:03
CPC Classifications
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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |