US5008593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coaxial liquid cooling of high power microwave excited plasma UV lamps
Assignee: United States Department of the Air Force
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Filing: 1990-07-13
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Granted: 1991-04-16
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Expires: 2010-07-13
Abstract
Abstract In a high power microwave excited plasma system including a microwave energy source operatively coupled to a plasma tube for generating a plasma within the tube, a gaseous medium within the tube for supporting a plasma and a reflector for focusing radiation emitted from the tube, an improved cooling system for the tube is provided which comprises a jacket surrounding the tube and defining a passageway therearound, a source of liquid dimethyl polysiloxane, and a circulator for conducting the liquid dimethyl polysiloxane through the passageway in heat exchange relationship with the tube.
Inventors
- 👤 LaVerne A. Schlie
- 👤 Robert D. Rathge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:42
CPC Classifications
H; H05; H05H; H05H1/00; H05H1/24; H05H1/46; H01; H01J; H01J65/00; H01J65/04; H01J65/042; H01J65/044; H01J7/00; H01J7/24; H01J7/26
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
141 words
In a high power microwave excited plasma system comprising: (a) a source of microwave energy; (b) a plasma tube operatively coupled to said source of microwave energy for generation of a plasma within said plasma tube in response to energy input thereinto from said source of microwave energy; (c) a gaseous medium within said plasma tube for supporting a plasma therein; (d) reflector means for focusing radiation emitted from said plasma tube; and (e) means for cooling said plasma tube; an improvement wherein said means for cooling said plasma tube comprises, (f) a jacket surrounding said plasma tube and defining a passageway around said plasma tube within said jacket; (g) a source of liquid dimethyl polysiloxane; and (h) means for circulating said liquid dimethyl polysiloxane through said passageway in heat exchange relationship with said plasma tube for cooling said plasma tube.
Claim 2
Dependent Claim
141 words
In a high power microwave excited plasma system comprising: (a) a source of microwave energy; (b) a plasma tube operatively coupled to said source of microwave energy for generation of a plasma within said plasma tube in response to energy input thereinto from said source of microwave energy; (c) a gaseous medium within said plasma tube for supporting a plasma therein; (d) reflector means for focusing radiation emitted from said plasma tube; and (e) means for cooling said plasma tube; an improvement wherein said means for cooling said plasma tube comprises, (f) a jacket surrounding said plasma tube and defining a passageway around said plasma tube within said jacket; (g) a source of liquid dimethyl polysiloxane; and (h) means for circulating said liquid dimethyl polysiloxane through said passageway in heat exchange relationship with said plasma tube for cooling said plasma tube.
Claim 3
Dependent Claim
20 words
The system of claim 1 wherein said liquid dimethyl polysiloxane has temperature in the range of -73° to 260° C.
Claim 4
Dependent Claim
24 words
The system of claim 1 wherein said reflector means has a geometric shape selected from the group consisting of elliptical, parabolic, involute and spherical.
Claim 5
Dependent Claim
25 words
The system of claim 1 wherein said gaseous medium comprises a material selected from the group consisting of xenon, mercury, a halide and boron chloride.
Claim 6
Dependent Claim
18 words
The system of claim 4 wherein said gaseous medium has pressure of from 10 -3 to 10 atm.
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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) | 1994-04-15 | 1994-10-15 | 1995-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-15 | 1998-10-15 | 1999-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-15 | 2002-10-15 | 2003-04-16 | $7700.00 | Window Closed / Lapsed |