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US3770366A
Expired / Lapsed
US
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Photoflash lamp and method of coating same
Assignee: GTE Sylvania Inc
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Filing: 1972-09-11
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Granted: 1973-11-06
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Expires: 1992-09-11
Abstract
Abstract In a photoflash lamp having a vacuum-formed thermoplastic coating over its glass envelope for providing reinforcement, a silicone mold release agent is disposed between the plastic coating and glass envelope to relieve high localized stresses and provide a more uniform compressive loading on the glass. In a method for applying the thermoplastic coating, the silicone release agent is sprayed onto the glass envelope of the lamp before it is located in a preformed sleeve of the thermoplastic material, which is subsequently vacuum-formed onto the glass envelope.
Inventors
- 👤 E Audesse
- 👤 H Hough
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:04
CPC Classifications
G; G03; G03B; G03B15/00; G03B15/02; G03B15/03; G03B15/04; G03B15/0478; G03B15/0484; F; F21; F21K; F21K5/00; F21K5/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
31 words
A lamp according to claim 1 wherein said coating means exerts a substantially uniform compressive load on said glass envelope of from about 1000 to about 4000 pounds per square inch.
Claim 2
Dependent Claim
16 words
A lamp according to claim 1 wherein said coating means and said release agent are clear.
Claim 3
Dependent Claim
32 words
A lamp according to claim 1 wherein the thermoplastic coating means comprises a material having a coefficient of thermal expansion substantially greater than the coefficient of thermal expansion of said glass envelope.
Claim 4
Dependent Claim
37 words
A lamp according to claim 1 wherein the composition of said coating means comprises a light-transmitting thermoplastic selected from the group consisting of acrylic, acrylonitrile-butadiene-styrene, cellulose acetate, ionomers, methylpentene polymer, nylon, polycarbonate, polystyrene, polysulfone, and alloys thereof.
Claim 5
Dependent Claim
20 words
A lamp according to Claim 5 wherein the composition of said coating means further includes a small amount of plasticizer.
Claim 6
Dependent Claim
16 words
A lamp according to claim 1 wherein said release agent is a silicone mold release agent.
Claim 7
Dependent Claim
15 words
A lamp according to claim 1 wherein said thermoplastic coating means comprises a polycarbonate resin.
Claim 8
Dependent Claim
16 words
A lamp according to claim 8 wherein said release agent is a silicone mold release agent.
Claim 9
Dependent Claim
36 words
A lamp according to claim 9 wherein the thickness of said polycarbonate coating means is about 0.020 inch and said release agent is disposed as a thin film between said glass envelope and thermoplastic coating means.
Claim 10
Dependent Claim
29 words
A lamp according to claim 1 wherein said combustion-supporting gas in said envelope is at a pressure exceeding one atmosphere, and said combustible material in said envelope is filamentary.
References Cited (Backward Citations)
GB567363A
Cited
US2852134A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |