US3609331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoflash lamp
Assignee: GTE Sylvania Inc
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Filing: 1968-06-26
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Granted: 1971-09-28
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Expires: 1988-06-26
Abstract
Abstract A flashcube in which readily visible indicators are provided for identifying a flashed lamp. The indicator material is responsive to the heat generated by the flashlamp to thereby be deposited on the window of the flashcube and define a noticeable colored area thereon.
Inventors
- 👤 William C Fink
- 👤 John W Shaffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:10
CPC Classifications
G; G03; G03B; G03B15/00; G03B15/02; G03B15/03; G03B15/04; G03B15/0442
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
98 words
In a multilamp photoflash unit comprising a transparent closed container having a plurality of flashlamps disposed therein each lamp facing a different wall of said transparent container whereby a window is provided for each of said lamps, a flashed-lamp indicator comprising a spot of paste containing a dye located in heat-receiving relationship with respect to each of said flashlamps, said dye being volatilizable from the heat of lamp flashing to thereby be deposited on the inside face of said window to define a noticeable colored area on said window to thereby identify said lamp as having been flashed.
Claim 2
Dependent Claim
98 words
In a multilamp photoflash unit comprising a transparent closed container having a plurality of flashlamps disposed therein each lamp facing a different wall of said transparent container whereby a window is provided for each of said lamps, a flashed-lamp indicator comprising a spot of paste containing a dye located in heat-receiving relationship with respect to each of said flashlamps, said dye being volatilizable from the heat of lamp flashing to thereby be deposited on the inside face of said window to define a noticeable colored area on said window to thereby identify said lamp as having been flashed.
Claim 3
Dependent Claim
35 words
The combination of claim 1 in which the spot of paste containing a dye is located on the outside surface of each of said flashlamps and, when the lamp is flashed, deposits on said window.
Claim 4
Dependent Claim
31 words
The combination of claim 1 in which said dye is a solvent dye characterized by high vapor pressure at the temperatures attained by the exterior surface of the lamp on flashing.
Claim 5
Dependent Claim
32 words
The combination of claim 1 in which said paste includes a black nonvolatile pigment whereby the spot absorbs infrared radiation from the radiant energy of the flashed lamp and thus facilitates vaporization.
Claim 6
Dependent Claim
27 words
The combination of claim 1 in which the dye paste comprises water, a binding agent, a dispersing agent, a black nonvolatile pigment and an easily sublimed dye.
Claim 7
Dependent Claim
25 words
The combination of claim 5 in which the binding agent is polyvinyl alcohol, the dispersing agent is lignin sulfate and the black pigment is Fe304.
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) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |