Patent US5022066A successfully refreshed from Google Patents.
US3586471A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoflash lamp
Assignee: GTE Sylvania Inc
•
Filing: 1969-11-19
•
Granted: 1971-06-22
•
Expires: 1989-11-19
Abstract
Abstract A percussive-type photoflash lamp in which the inner wall of the lamp envelope is provided with an indicator spot containing a fluorescent dye sensitive to the combustion products of the fulminating material of the primer in order to permit automated inspection and rejection of those lamps or subassemblies thereof during manufacture in which the fulminating material has been flashed inadvertently. Refractive pigments substantially transparent to ultraviolet light are included to obtain easier visual inspection in ordinary light and a substantial increase in emitted light intensity under ultraviolet light.
Inventors
- 👤 Thomas B Mcdonough
- 👤 John W Shaffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:35
CPC Classifications
F; F21; F21K; F21K5/00; F21K5/02; F21K5/023; F21K5/026
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
83 words
A photoflash lamp comprising: an hermetically sealed, light-transmitting envelope; a quantity of filamentary combustible material located within said envelope; a combustion-supporting gas in said envelope; a primer secured to and extending from one end of said envelope, said primer including a charge of fulminating material; and means located within said envelope for indicating the functional condition of said fulminating material, said means comprising a fluorescent dye sensitive to combustion products of said fulminating material and a refractive pigment substantially transparent to ultraviolet light.
Claim 2
Dependent Claim
83 words
A photoflash lamp comprising: an hermetically sealed, light-transmitting envelope; a quantity of filamentary combustible material located within said envelope; a combustion-supporting gas in said envelope; a primer secured to and extending from one end of said envelope, said primer including a charge of fulminating material; and means located within said envelope for indicating the functional condition of said fulminating material, said means comprising a fluorescent dye sensitive to combustion products of said fulminating material and a refractive pigment substantially transparent to ultraviolet light.
Claim 3
Dependent Claim
42 words
The combination of claim 1 in which said indicating means is a spot of a fluid formulated from the combination of a binder, a solvent, a humectant, a buffer, an acid-sensitive fluorescent dye and a refractive pigment substantially transparent to ultraviolet light.
Claim 4
Dependent Claim
34 words
The combination of claim 2 in which the binder is polyvinyl alcohol, the humectant is glycerine, the buffer is sodium bicarbonate, the acid-sensitive fluorescent dye is dichlorofluorescein and the refractory pigment is silicon dioxide.
Claim 5
Dependent Claim
56 words
The combination of claim 1 in which said indicating means is a spot of a fluid having the following formulation of parts by weight: 1 part dichlorofluorescein, 4 parts sodium bicarbonate, 130 parts glycerol, 360 parts of 10 percent solution of low viscosity, partially hydrolyzed polyvinyl alcohol in distilled water, and 180 parts of silicon dioxide.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |