US4039889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blue-white glow lamp
Assignee: General Electric Co
•
Filing: 1976-02-25
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Granted: 1977-08-02
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Expires: 1996-02-25
Abstract
Abstract A bluish-white glow lamp is described having a gas mixture comprising neon and xenon and a phosphor coating on the inside of the envelope comprising zinc silicate and calcium tungstate.
Inventors
- 👤 Egon Vicai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:46
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/12; H01J61/16; H01J61/38; H01J61/42; H01J61/44; H01J61/64
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
106 words
A negative discharge glow lamp comprising: a light translucent envelope; at least two electrodes positioned approximately parallel to each other inside said envelope; an atmosphere inside said envelope consisting essentially of 1-15% xenon, balance neon, at a pressure of from 6.6×10 3 to 1.5×10 4 pascals absolute; and a phosphor coating on the interior of said envelope comprising a mixture of manganese-activated zinc silicate and calcium tungstate phosphors; said lamp characterized by a firing voltage of 80-125 volts d.c., a maintaining voltage of 40-70 volts d.c., and a light output having coordinates within a radius of 0.04 of point (0.29; 0.38) on the CIE chromaticity diagram.
Claim 2
Dependent Claim
106 words
A negative discharge glow lamp comprising: a light translucent envelope; at least two electrodes positioned approximately parallel to each other inside said envelope; an atmosphere inside said envelope consisting essentially of 1-15% xenon, balance neon, at a pressure of from 6.6×10 3 to 1.5×10 4 pascals absolute; and a phosphor coating on the interior of said envelope comprising a mixture of manganese-activated zinc silicate and calcium tungstate phosphors; said lamp characterized by a firing voltage of 80-125 volts d.c., a maintaining voltage of 40-70 volts d.c., and a light output having coordinates within a radius of 0.04 of point (0.29; 0.38) on the CIE chromaticity diagram.
Claim 3
Dependent Claim
31 words
The device as set forth in claim 1 wherein said device produces radiant energy having coordinates within a radius of 0.08 of the equal energy point on the CIE chromaticity diagram.
Claim 4
Dependent Claim
22 words
The device as set forth in claim 2 wherein said device produces radiant energy having the coordinates (0.31; 0.39) on said diagram.
Claim 5
Dependent Claim
16 words
The device as set forth in claim 1 wherein phosphor-activated phosphor further comprises a lead activator.
Claim 6
Dependent Claim
18 words
The device as set forth in claim 1 wherein said electrodes are spaced 0.7 millimeters from each other.
Claim 7
Dependent Claim
21 words
The device as set forth in claim 1 wherein said radiant energy is produced at a current of approximately 2.5 milliamperes.
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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) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |