US3876895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective spectral output metal halide lamp
Assignee: General Electric Co
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Filing: 1972-01-17
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Granted: 1975-04-08
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Expires: 1992-01-17
Abstract
Abstract A high pressure metal halide vapor arc lamp providing radiation concentrated in selected spectral bands. The filling comprises metal halide buffer species in addition to metal halide emitter species. The buffer species increase the energy input to the arc, thereby augmenting the radiation from the emitter species. The radiation from the buffer species may be negligible or is largely suppressed. A lamp emitting in the blue, green and red bands comprises a limited quantity of ZnI.sub.2 as buffer species which serve to augment the radiation from LiI and TlI present as emitter species, optionally with a limited quantity of Hg as a secondary buffer.
Inventors
- 👤 William H Lake
- 👤 Delmar D Kershaw
- 👤 John M Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:15
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/04; H01J61/045; H01J61/12; H01J61/18
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
77 words
A HIGH INTENSITY LAMP PROVIDING RADIATION CONCENTRATED IN SELECTED SPECTRAL BANDS COMPRISING: AN HERMETICALLY SEALED LIGHT-TRANSMISSIVE ENVELOPE; A PAIR OF ARC ELECTRODES SEALED THEREIN AND DEFINING AN ARC GAP; AN INERT STARTING GAS AT A PRESSURE OF A FEW TORR THEREIN; AND A CHARGE THEREIN COMPRISING PER CUBIC CENTIMETER OF ENVELOPE VOLUME FROM ABOUT .02 TO 2.0 MILLIGRAMS OF LIL, FROM ABOUT .02 TO 1.5 MILLIGRANS OF ZNL2, AND FROM ABOUT .02 TO 3.0 MILLIGRAMS OF TII.
Claim 2
Dependent Claim
77 words
A HIGH INTENSITY LAMP PROVIDING RADIATION CONCENTRATED IN SELECTED SPECTRAL BANDS COMPRISING: AN HERMETICALLY SEALED LIGHT-TRANSMISSIVE ENVELOPE; A PAIR OF ARC ELECTRODES SEALED THEREIN AND DEFINING AN ARC GAP; AN INERT STARTING GAS AT A PRESSURE OF A FEW TORR THEREIN; AND A CHARGE THEREIN COMPRISING PER CUBIC CENTIMETER OF ENVELOPE VOLUME FROM ABOUT .02 TO 2.0 MILLIGRAMS OF LIL, FROM ABOUT .02 TO 1.5 MILLIGRANS OF ZNL2, AND FROM ABOUT .02 TO 3.0 MILLIGRAMS OF TII.
Claim 3
Dependent Claim
22 words
A lamp as in claim 1 containing in addition not over about 0.25 milligrams of mercury per cubic centimeter of envelope volume.
Claim 4
Dependent Claim
22 words
A lamp as in claim 1 containing in addition not over about 1 milligram of mercury per cubic centimeter of envelope volume.
Claim 5
Dependent Claim
13 words
A lamp as in claim 1 wherein the electrodes consist of unactivated tungsten.
Claim 6
Dependent Claim
36 words
A lamp as in claim 1 containing per cubic centimeter of envelope volume about .57 mg. of LiI, about .91 mg. of TlI, about .63 mg. of ZnI.sub.2 and in addition about .06 mg. of Hg.
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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) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |