Patent JPS5519801A successfully refreshed from Google Patents.
US3685947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoflash lamp
Assignee: US Philips Corp
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Filing: 1970-10-05
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Granted: 1972-08-22
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Expires: 1990-10-05
Abstract
Abstract A photoflash lamp employing ignition by means of electrical breakdown in which the ignition mass is provided on an electrically insulating body which is covered by two thin layers of metal serving as electrodes and being connected to the current conductors. The electrically insulating body including the ignition mass is provided within the envelope which furthermore contains a metal wire filling and an oxidizing gas.
Inventors
- 👤 Charles Cornelis Edu Meulemans
- 👤 Johannes Cornelis Van Der Tas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:14
CPC Classifications
F; F21; F21K; F21K5/00; F21K5/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
69 words
A photoflash lamp as claimed in claim 1 wherein the surface of the body of electrically insulated material is provided with a groove located centrally between those points of the surface of the body where said surface is penetrated by the current conductors and is directed at right angles to the line of connection between said points, the independent conducting layers extending to the vertical edges of said grooves.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |