US3714493A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compact metal halide arc lamp containing primarily mercury iodide
Assignee: General Electric Co
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Filing: 1970-04-06
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Granted: 1973-01-30
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Expires: 1990-04-06
Abstract
Abstract A compact very high brightness arc lamp operating with near molten electrode tips and using mercury iodide as the discharge medium, preferably with an excess of iodine. In the pressure range from 5 to 20 atmospheres, mercury iodide produces a high ratio of ultraviolet to visible radiation making the lamp particularly suitable for photochemical applications requiring a point source for high definition. As the pressure is increased, the spectrum first exhibits pronounced blue and green lines of mercury, and then gradually more red. At very high pressures in the range from 100 to 150 atmospheres, white light is produced with a sun-like continuum.
Inventors
- 👤 E Fridrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:57
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/98; H01J61/02; H01J61/12; H01J61/125; H01J61/18
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
119 words
A compact electric discharge lamp comprising a sealed envelope of refractory light-pervious material, electrodes projecting into said envelope of which at least one is a small tungsten rod serving as cathode correlated in heat-dissipating capacity to the input loading of the lamp whereby to operate with its tip at a temperature close to the melting point of tungsten, the input loading into said lamp being in the range of 1,000 to 15,000 watts per cubic centimeter, and an ionizable medium in said envelope consisting of an inert starting gas and a quantity of mercury and iodine forming mercury iodide exerting a pressure in the range of 5 to 150 atmospheres when totally vaporized in normal operation of said lamp.
Claim 2
Dependent Claim
119 words
A compact electric discharge lamp comprising a sealed envelope of refractory light-pervious material, electrodes projecting into said envelope of which at least one is a small tungsten rod serving as cathode correlated in heat-dissipating capacity to the input loading of the lamp whereby to operate with its tip at a temperature close to the melting point of tungsten, the input loading into said lamp being in the range of 1,000 to 15,000 watts per cubic centimeter, and an ionizable medium in said envelope consisting of an inert starting gas and a quantity of mercury and iodine forming mercury iodide exerting a pressure in the range of 5 to 150 atmospheres when totally vaporized in normal operation of said lamp.
Claim 3
Dependent Claim
33 words
A lamp as in claim 1 wherein the cathode electrode and the opposite main electrode define a short arc gap not exceeding the maximum transverse dimension of the arc chamber within said envelope.
Claim 4
Dependent Claim
23 words
A lamp as in claim 1 wherein there is an excess of iodine in said filling over the stoichiometric quantity in mercury iodide.
Claim 5
Dependent Claim
45 words
A lamp as in claim 1 wherein the transverse diameter of the arc chamber is less than 1 centimeter and wherein the operating pressure is in the range of 5 to 20 atmospheres to provide a point source of ultraviolet radiation of high intrinsic brilliance.
Claim 6
Dependent Claim
51 words
A lamp as in claim 1 wherein there is an excess of iodine in said filling over the stoichiometric quantity in mercury iodide and wherein the cathode electrode and the opposite main electrode define a short arc gap not exceeding the maximum transverse dimension of the arc chamber within said envelope.
Claim 7
Dependent Claim
63 words
A lamp as in claim 1 wherein there is an excess of iodine in said filling over the stoichiometric quantity in mercury iodide and wherein the transverse diameter of the arc chamber is less than one centimeter and wherein the operating pressure is in the range of 5 to 20 atmospheres to provide a point source of ultraviolet radiation of high intrinsic brilliance.
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) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |