US3902946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoflash lamp and method of coating same
Assignee: GTE Sylvania Inc
•
Filing: 1973-07-19
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Granted: 1975-09-02
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Expires: 1993-07-19
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
- 👤 Emery G Audesse
- 👤 Harold L Hough
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:10
CPC Classifications
F; F21; F21K; F21K5/00; F21K5/02; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1005; Y10T156/1028; Y10T156/103; Y10T156/1052; Y10T156/108
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
66 words
A METHOD OF COATING THE GLASS ENVELOPE OF A PHODOFLASH LAMP WITH A LIGHT-TRANSMITTING THEREMOPLASTIC MATERIAL, SAID METHOD COMPRISING: APPLYING A THIN COATING OF A LUBRICATING RELEASE AGENT ON THE EXTERIOR SRFACE OF SAID GLASS ENVELOPE, SAID RELEASE AGENT BEING CLEAR AND SUBSTANTIALLY INERT WITH RESPECT TO SAID GLASS AND THERMOPLASTIC, PLACING SAID FILM COATED GLASS ENVELOPE WITHIN A PREFORMED SLEEVE OF SAID THERMOPLASTIC MATERIAL, AND
Claim 2
Independent Claim
66 words
A METHOD OF COATING THE GLASS ENVELOPE OF A PHODOFLASH LAMP WITH A LIGHT-TRANSMITTING THEREMOPLASTIC MATERIAL, SAID METHOD COMPRISING: APPLYING A THIN COATING OF A LUBRICATING RELEASE AGENT ON THE EXTERIOR SRFACE OF SAID GLASS ENVELOPE, SAID RELEASE AGENT BEING CLEAR AND SUBSTANTIALLY INERT WITH RESPECT TO SAID GLASS AND THERMOPLASTIC, PLACING SAID FILM COATED GLASS ENVELOPE WITHIN A PREFORMED SLEEVE OF SAID THERMOPLASTIC MATERIAL, AND
Claim 3
Dependent Claim
55 words
The method of claim 1 wherein heat is applied uniformly about said sleeve and envelope assembly by one or more localized sources of heat encircling saiD assembly, and said assembly is indexed through a plurality of heating stations, each of which has said one or more localized sources of heat positioned at successively higher elevations.
Claim 4
Dependent Claim
30 words
The method of claim 1 including the further step of prebaking said thermoplastic sleeve to remove the mositure therefrom prior to assembling said sleeve with said film coated glass envelope.
Claim 5
Dependent Claim
26 words
The method of claim 1 including the further steps of constricting and tipping off said vacuum formed sleeve at the conclusion of said incremental heating process.
Claim 6
Dependent Claim
15 words
The method of claim 1 wherein said release agent is a silicone mold release agent.
Claim 7
Dependent Claim
22 words
The method of claim 1 wherein said release agent is applied by spraying it onto the exterior surface of said glass envelope.
Claim 8
Independent Claim
118 words
A method of coating the glass envelope of a photoflash lamp with a light transmitting thermoplastic material, said method comprising: applying a thin film coating of a lubricating release agent on the interior surface of a preformed sleeve of said thermoplastic material, said release agent being clear and substantially inert with respect to said glass and thermoplastic, placing said glass envelope within said interiorly coated sleeve of thermoplastic material, and drawing a vacuum in the space between said interiorly coated thermoplastic sleeve and said glass envelope, while simultaneously heating said sleeve and envelope assembly incrementally along the length thereof, whereby the temperature and vacuum cause said interiorly coated thermoplastic sleeve to be incrementally formed onto said glass envelope.
Claim 9
Independent Claim
118 words
A method of coating the glass envelope of a photoflash lamp with a light transmitting thermoplastic material, said method comprising: applying a thin film coating of a lubricating release agent on the interior surface of a preformed sleeve of said thermoplastic material, said release agent being clear and substantially inert with respect to said glass and thermoplastic, placing said glass envelope within said interiorly coated sleeve of thermoplastic material, and drawing a vacuum in the space between said interiorly coated thermoplastic sleeve and said glass envelope, while simultaneously heating said sleeve and envelope assembly incrementally along the length thereof, whereby the temperature and vacuum cause said interiorly coated thermoplastic sleeve to be incrementally formed onto said glass envelope.
Claim 10
Dependent Claim
29 words
The method of claim 7 including the further step of prebaking said thermoplastic sleeve to remove the moisture thereof prior to applying said coating of mold release agent thereon.
Claim 11
Dependent Claim
15 words
The method of claim 7 wherein said release agent is a silicone mold release agent.
Claim 12
Dependent Claim
24 words
The method of claim 7 wherein said release agent is applied by spraying it onto the interior of said preformed sleeve of thermoplastic material.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |