US3873260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoflash lamp
Assignee: General Electric Co
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Filing: 1973-11-16
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Granted: 1975-03-25
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Expires: 1993-11-16
Abstract
Abstract An inlead wire of a photoflash lamp is provided which is recessed in a sleeve of electrically insulating material for improved lamp ignition. The sleeve is also vented to the bulb interior cavity to prevent gas entrapment during primer application which could prevent lamp ignition. The sleeve can be positioned with a second dielectric member being employed to maintain the pair of inlead wires in a spaced apart relationship.
Inventors
- 👤 Paul T Cote
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:19
CPC Classifications
F; F21; F21K; F21K5/00; F21K5/02; F21K5/023
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
129 words
A photoflash lamp comprising a sealed bulb of light transparent material, a pair of inlead wires extending into said bulb in a spaced relationship, a mass of metallic combustible material substantially filling said bulb, a combustion supporting atmosphere in said bulb, and ignition means connected between said inlead wires, wherein the improvement comprises a sleeve of electrically insulating material extending beyond the end of only one inlead wire, said sleeve having a larger end opening than the diameter of said inlead wire with said opening being disposed at the sleeve end adjacent the mass of metallic combustible material in the sealed bulb cavity and being vented to said bulb cavity, and a mass of primer material which bridges the end of said sleeved inlead and the other inlead wire.
Claim 2
Dependent Claim
129 words
A photoflash lamp comprising a sealed bulb of light transparent material, a pair of inlead wires extending into said bulb in a spaced relationship, a mass of metallic combustible material substantially filling said bulb, a combustion supporting atmosphere in said bulb, and ignition means connected between said inlead wires, wherein the improvement comprises a sleeve of electrically insulating material extending beyond the end of only one inlead wire, said sleeve having a larger end opening than the diameter of said inlead wire with said opening being disposed at the sleeve end adjacent the mass of metallic combustible material in the sealed bulb cavity and being vented to said bulb cavity, and a mass of primer material which bridges the end of said sleeved inlead and the other inlead wire.
Claim 3
Dependent Claim
23 words
A lamp as in claim 1 wherein the inlead wires are spaced apart with dielectric support means positioned substantially laterally across both inleads.
Claim 4
Dependent Claim
155 words
A photoflash lamp comprising a sealed glass bulb, a pair of inlead wires hermetically sealed through the wall of said bulb and extending in spaced apart relationship into said bulb, a mass of metallic combustible material substantially filling said bulb, a combustion supporting atmosphere in said bulb, and ignition means connected between said inlead wires, wherein the improvement comprises a sleeve of electrically insulating material extending beyond the end of only one inlead wire which includes a larger end opening than the diameter of said inlead wire with said opening being disposed at the sleeve end adjacent the mass of metallic combustible material in the sealed bulb cavity and being vented to said bulb cavity, and a mass of primer material which bridges the end of said sleeved inlead and the other inlead wire, said primer mass further extending into the larger end opening of the insulating sleeve beyond the end of the inlead wire.
Claim 5
Dependent Claim
155 words
A photoflash lamp comprising a sealed glass bulb, a pair of inlead wires hermetically sealed through the wall of said bulb and extending in spaced apart relationship into said bulb, a mass of metallic combustible material substantially filling said bulb, a combustion supporting atmosphere in said bulb, and ignition means connected between said inlead wires, wherein the improvement comprises a sleeve of electrically insulating material extending beyond the end of only one inlead wire which includes a larger end opening than the diameter of said inlead wire with said opening being disposed at the sleeve end adjacent the mass of metallic combustible material in the sealed bulb cavity and being vented to said bulb cavity, and a mass of primer material which bridges the end of said sleeved inlead and the other inlead wire, said primer mass further extending into the larger end opening of the insulating sleeve beyond the end of the inlead wire.
Claim 6
Dependent Claim
23 words
A lamp as in claim 3 wherein the inlead wires are spaced apart with dielectric support means positioned substantially laterally across both inleads.
Claim 7
Dependent Claim
16 words
A lamp as in claim 4 wherein said dielectric support means also positions the insulating sleeve.
Claim 8
Dependent Claim
152 words
A photoflash lamp comprising a sealed glass bulb, a pair of inlead wires hermetically sealed through the wall of said bulb and extending in spaced apart relationship into said bulb, a mass of metallic combustible material substantially filling said bulb, a coMbustion supporting atmosphere in said bulb, and ignition means connected between said inlead wires, wherein the improvement comprises a sleeve of electrically insulating material extending beyond the end of only one inlead wire which includes a larger end opening than the diameter of said inlead wire with said opening being disposed at the sleeve end adjacent the mass of metallic combustible material in the sealed bulb cavity and being vented to said bulb cavity and with said sleeved inlead wire forming a gap spacing with a bare inlead wire which is bent to provide electrical contact with adjacent combustible material, said gap spacing being bridged with a mass of primer material.
Claim 9
Dependent Claim
152 words
A photoflash lamp comprising a sealed glass bulb, a pair of inlead wires hermetically sealed through the wall of said bulb and extending in spaced apart relationship into said bulb, a mass of metallic combustible material substantially filling said bulb, a coMbustion supporting atmosphere in said bulb, and ignition means connected between said inlead wires, wherein the improvement comprises a sleeve of electrically insulating material extending beyond the end of only one inlead wire which includes a larger end opening than the diameter of said inlead wire with said opening being disposed at the sleeve end adjacent the mass of metallic combustible material in the sealed bulb cavity and being vented to said bulb cavity and with said sleeved inlead wire forming a gap spacing with a bare inlead wire which is bent to provide electrical contact with adjacent combustible material, said gap spacing being bridged with a mass of primer material.
Claim 10
Dependent Claim
23 words
A lamp as in claim 6 wherein the inlead wires are spaced apart with dielectric support means positioned substantially laterally across both inleads.
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) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |