Patent US3751656A successfully refreshed from Google Patents.
US3751656A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible plastic flash illumination devices with solid pyrotechnic material
Assignee: Polaroid Corp
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Filing: 1972-01-10
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Granted: 1973-08-07
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Expires: 1992-01-10
Abstract
Abstract Flash illumination devices are formed of transparent sheet plastic wherein a pair of opposed walls are marginally secured together to provide a cavity for retaining pyro-technic material. The pyrotechnic material comprises a combustible material and a solid oxidant. Ignition means are associated with the flash devices.
Inventors
- 👤 S Buckler
- 👤 D Kennedy
- 👤 K Norland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:17
CPC Classifications
G; G03; G03B; G03B15/00; G03B15/02; G03B15/03; G03B15/04; G03B15/0478; G03B15/0484; F; F21; F21K; F21K5/00; F21K5/02; G03B15/0442
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
51 words
A product as defined in claim 1 wherein said multiwall envelope comprises an inner wall and an outer wall; said inner wall being comprised of flattened plastic seamless tubing and said pyrotechnic material being sealed within said inner wall, said inner wall being secured in predetermined position to said outer wall.
Claim 2
Dependent Claim
31 words
A product as defined in claim 2 wherein said outer wall is composed of a heat shrinkable polymeric material and said inner wall is composed of a thermally stable polymeric material.
Claim 3
Dependent Claim
17 words
A product as defined in claim 2 wherein said igniting means are carried within said inner wall.
Claim 4
Dependent Claim
74 words
A product as defined in claim 1 wherein said transparent sheet plastic is comprised of a plurality of laminations each being a flattened tubular sleeve of plastic film to effect a multiwall envelope, said envelope constituting an outer envelope and an inner envelope, said inner envelope comprising flattened plastic film seamless tubing; said pyrotechnic material being retained within said inner envelope and said inner envelope being secured in predetermined position in said outer envelope.
Claim 5
Dependent Claim
17 words
A product as defined in claim 5 wherein said igniting means are retained within said inner envelope.
Claim 6
Dependent Claim
22 words
A product as defined in claim 3 wherein said outer wall comprises vinylidene chloride copolymer and said inner wall comprises polyvinyl chloride.
Claim 7
Dependent Claim
17 words
A product as defined in claim 1 wherein said pyrotechnic material comprises potassium perchlorate and zirconium powder.
Claim 8
Dependent Claim
15 words
A product as defined in claim 1 wherein said igniting means comprises electrical connection means.
Claim 9
Dependent Claim
27 words
A product as defined in claim 1 wherein said igniting means comprises means for applying thermal energy to saiD pyrotechnic material sufficient to ignite said pyrotechnic material.
Claim 10
Dependent Claim
19 words
A product as defined in claim 1 wherein said igniting means comprises means for percussively igniting said pyrotechnic material.
Claim 11
Dependent Claim
53 words
A product as defined in claim 1 which includes pyrotechnic material sealed in said envelope; and igniting means in said envelope for igniting said charge; and a metallic backing means in said envelope covering a substantial area of a wall thereof intermediate said wall and said pyrotechnic material to effect a heat sink.
Claim 12
Dependent Claim
44 words
A product as defined in claim 1 which includes a pyrotechnic material sealed in said envelope; and igniting means in said envelope for igniting said charge; and a reflective surface means in said envelope intermediate said pyrotechnic material and a wall of said envelope.
Claim 13
Dependent Claim
20 words
A product as defined in claim 13 wherein said reflective surface means is a surface of a metallic backing means.
Claim 14
Dependent Claim
16 words
A product as defined in claim 1 wherein said transparent sheet plastic includes reinforcing fibrous means.
Claim 15
Dependent Claim
62 words
A multiple flash illumination device arrangement comprising a strip of transparent sheet plastic having a pair of opposed walls marginally secured together to provide a plurality of spaced pyrotechnic retaining cavities, pyrotechnic material comprising a combustible material and a solid oxidant retained therein, and means for sequentially igniting said pyrotechnic material wherein individual flash illumination devices are separable from adjacent flash devices.
Claim 16
Dependent Claim
20 words
A product as defined in claim 16 wherein each of said flash devices is joined by a foldable end margin.
Claim 17
Dependent Claim
76 words
A flash illumination device comprising a flexible transparent sheet plastic envelope, said envelope comprising a first wall of heat shrinkable polymeric material and a second wall of thermally stable polymeric material, one of said walls comprising an inner wall and the other of said walls comprising an outer wall, and a pyrotechnic material retained within said inner wall, said pyrotechnic material comprising a combustible material and a solid oxidant and means for igniting said pyrotechnic material.
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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |