US3749547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flashlamp with improved combustible foil
Assignee: Airco Inc
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Filing: 1971-09-09
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Granted: 1973-07-31
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Expires: 1991-09-09
Abstract
Abstract A photo flashlamp containing an improved metallic combustible foil composite comprising a layer of a pyrophoric metal, for example, yttrium, interposed between two layers of nonpyrophoric metal, wherein nonpyrophoric metals such as aluminum, hafnium, magnesium or the like may be used. A method for making a metallic combustible foil composite comprising depositing, in a vacuum chamber, a layer of pyrophoric metal on a layer of combustible nonpyrophoric metal and then depositing a layer of combustible nonpyrophoric metal on the exposed surface of the pyrophoric metal layer.
Inventors
- 👤 E Gregory
- 👤 W Marancik
- 👤 W Shattes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:59
CPC Classifications
F; F21; F21K; F21K5/00; F21K5/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
27 words
A photoflash lamp as defined in claim 1 wherein said non-pyrophoric material is selected from the group consisting of aluminum, hafnium, magnesium and mixtures and alloys thereof.
Claim 2
Dependent Claim
14 words
A photoflash lamp as defined in claim 1 wherein said pyrophoric material is yttrium.
Claim 3
Dependent Claim
32 words
A photoflash lamp as defined in claim 1 wherein said composite material comprises a multi-layered foil having at least one layer of pyrophoric material and at least one layer of non-pyrophoric material.
Claim 4
Dependent Claim
33 words
A photoflash lamp as defined in claim 4 wherein said pyrophoric material is yttrium and said non-pyrophoric material is selected from the group consisting of aluminum, hafnium, magnesium and mixtures and alloys thereof.
Claim 5
Dependent Claim
26 words
A photoflash lamp as defined in claim 4 wherein said multi-layered foil includes at least four discrete layers made up of sAid pyrophoric and non-pyrophoric materials.
Claim 6
Dependent Claim
13 words
A photoflash lamp as defined in claim 4 wherein said foils are shredded.
References Cited (Backward Citations)
US3490855A
Cited
US3672814A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |