US3679928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High intensity far u.v. radiation source
Assignee: General Electric Co
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Filing: 1970-06-26
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Granted: 1972-07-25
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Expires: 1990-06-26
Abstract
Abstract A far U.V. radiation source emitting high intensity of U.V. wavelengths principally shorter than 2,300 A.U. includes a low pressure of mercury vapor in the range 10 3 to 0.75 torr under operating conditions in an ambient of a noble gas at a pressure of 0.5 to 25 torr. During operation, lamp current is very high, in range of 0.5 to 25 ampere/cm.2, emitting strongly at 1,849 and 1,942 A.U.
Inventors
- 👤 Peter D Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:10
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/12; H01J61/70; H01J61/72
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
177 words
A far ultraviolet emitting lamp comprising: a. an evacuable envelope including as a portion thereof a U.V. transmissive section having a predetermined cross-sectional area; b. a filling within said lamp of b1. a partial pressure of A noble ionizable gas selected from the group consisting of helium, argon, neon within the pressure range of approximately 0.1 to 25 torr, b2. a quantity of a vaporizable ionizable metal sufficient under lamp operating conditions to provide a steady state partial pressure of metal vapor within said envelope within the range of 10 3 to 0.75 torr, at operating lamp envelope temperature; c. means coupled with said filling within said envelope for applying an electric voltage thereto, c1. said voltage being sufficient to establish an electric discharge within said lamp to establish a U.V. emitting electric plasma within said U.V. transmissive section of said envelope, d. said lamp plasma including principally ionized mercury sustaining a current density of at least 0.5 ampere/cm2 and emitting at least one strong band of resonance radiation within the range of 1,800 to 2,200 A.U.
Claim 2
Dependent Claim
177 words
A far ultraviolet emitting lamp comprising: a. an evacuable envelope including as a portion thereof a U.V. transmissive section having a predetermined cross-sectional area; b. a filling within said lamp of b1. a partial pressure of A noble ionizable gas selected from the group consisting of helium, argon, neon within the pressure range of approximately 0.1 to 25 torr, b2. a quantity of a vaporizable ionizable metal sufficient under lamp operating conditions to provide a steady state partial pressure of metal vapor within said envelope within the range of 10 3 to 0.75 torr, at operating lamp envelope temperature; c. means coupled with said filling within said envelope for applying an electric voltage thereto, c1. said voltage being sufficient to establish an electric discharge within said lamp to establish a U.V. emitting electric plasma within said U.V. transmissive section of said envelope, d. said lamp plasma including principally ionized mercury sustaining a current density of at least 0.5 ampere/cm2 and emitting at least one strong band of resonance radiation within the range of 1,800 to 2,200 A.U.
Claim 3
Dependent Claim
27 words
The lamp of claim 1 wherein said vaporizable ionizable metal is mercury and said resonance radiation includes radiation at wavelengths of substantially 1,849 A.U. and 1,942 A.U.
Claim 4
Dependent Claim
21 words
The lamp of claim 1 wherein said current density sustained by said plasma charge lamp operation is at least 10 A/cm2.
Claim 5
Dependent Claim
22 words
The lamp of claim 1 wherein the partial pressure of said gas within said envelope is from approximately 2 to 4 torr.
Claim 6
Dependent Claim
18 words
The lamp of claim 1 wherein said plasma sustains a current of from approximately 4.0 to 100 A/cm2.
Claim 7
Dependent Claim
18 words
The lamp of claim 5 wherein the plasma sustains a current of from approximately 5 to 25 A/cm2.
Claim 8
Dependent Claim
36 words
The lamp of claim 1 wherein said means for applying a voltage to the filling within said lamp include a pair of electrodes sealed through end regions of said lamp and located within said evacuable envelope.
Claim 9
Dependent Claim
16 words
The lamp of claim 7 wherein one of said lamp electrodes is a thermionically emissive cathode.
Claim 10
Dependent Claim
29 words
The lamp of claim 7 wherein both of said electrodes are thermionically emissive and means adapted to serve as anode electrode members are associated with each of said electrodes.
Claim 11
Dependent Claim
31 words
The lamp of claim 1 wherein said means for applying a voltage to said filling within said lamp is externally located with respect to said envelope and is inductively coupled thereto.
Claim 12
Dependent Claim
43 words
The lamp of claim 1 wherein said lamp envelope is maintained at a minimum interior temperature of approximately 35*-100* C., yielding a mercury vapor pressure of approximately 4 X 10 3 to 0.3 torr and said lamp emits strongly at 1,849 A.U. wavelength.
Claim 13
Dependent Claim
48 words
The lamp of claim 1 wherein said minimum interior lamp envelope is maintained at a temperature of approximately 25* to 50* C., yielding a mercury vapor pressure of approximately 2 X 10 3 to 1.3 X 10 2 torr and said lamp emits strongly at 1,942 A.U. wavelength.
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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |