Patent US3694618A successfully refreshed from Google Patents.
US3694618A
Expired / Lapsed
US
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High pressure thermal plasma system
Assignee: Humphreys Corp
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Filing: 1971-08-03
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Granted: 1972-09-26
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Expires: 1991-08-03
Abstract
Abstract A high pressure induction plasma system of the flowing type includes structure defining a plasma chamber, an electrical coil surrounding the plasma chamber for creating an intense electromagnetic field within the plasma chamber, means to supply a gas for flow through the chamber under at least 10 atmospheres of pressure and conversion to plasma condition under the influence of the electromagnetic field, a flow restriction structure spaced at least one chamber diameter downstream from the electrical coil and structure defining a stabilizing volume between the coil and the flow restriction. This stabilizing volume provides aerodynamic and electrical compensation and allows flowing operation of the system at pressures of 50 atmospheres and above.
Inventors
- 👤 John W Poole
- 👤 Merle L Thorpe
- 👤 Charles E Vogel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:48
CPC Classifications
H; H05; H05H; H05H1/00; H05H1/24; H05H1/46
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
115 words
An induction plasma system comprising: structure defining a plasma chamber, an electrical coil surrounding said chamber and adapted to be connected to suitable power supply for creating an intense electromagnetic field within said chamber, means for supplying a gas under at least 10 atmospheres of pressure for flow into said chamber and conversion to plasma condition under the influence of the electromagnetic field produced by said electrical coil, flow restriction structure defining a port for flow of said gas from said chamber, said flow restriction structure being spaced at least one chamber diameter from the downstream end of said electrical coil, and structure defining a stabilizing volume between said coil and said flow restriction structure.
Claim 2
Dependent Claim
115 words
An induction plasma system comprising: structure defining a plasma chamber, an electrical coil surrounding said chamber and adapted to be connected to suitable power supply for creating an intense electromagnetic field within said chamber, means for supplying a gas under at least 10 atmospheres of pressure for flow into said chamber and conversion to plasma condition under the influence of the electromagnetic field produced by said electrical coil, flow restriction structure defining a port for flow of said gas from said chamber, said flow restriction structure being spaced at least one chamber diameter from the downstream end of said electrical coil, and structure defining a stabilizing volume between said coil and said flow restriction structure.
Claim 3
Dependent Claim
82 words
The system as claimed in claim 1 wherein said stabilizing volume is related to the spacing of said flow restriction structure from the downstream end of said coil, said volume being at least three times the plasma chamber volume with said flow restriction structure spaced one chamber diameter from said coil and being equal to a uniform dimensional extension of said plasma chamber when said flow restriction structure is spaced at least three chamber diameters from the downstream end of said coil.
Claim 4
Dependent Claim
28 words
The system as claimed in claim 1 wherein said gas flow through said chamber is a function of, approximately, the three-fourths power of the chamber pressure in atmospheres.
Claim 5
Dependent Claim
72 words
The system as claimed in claim 1 wherein said chamber defining structure includes a first tubular structure and further including a second tubular structure coaxially aligned with, surrounding and spaced from said first tubular structure such that an annular intermediate chamber is defined and means to supply fluid under pressure to said intermediate chamber, as to maintain the pressure in said intermediate chamber at least one-third the pressure in said plasma chamber.
Claim 6
Dependent Claim
24 words
The system as claimed in claim 1 and further including segmented electrically conductive material on the inner surface of said plasma chamber defining structure.
Claim 7
Dependent Claim
82 words
The system as claimed in claim 5 wherein said stabilizing volume is related to the spacing of said flow restriction structure from the downstream end of said coil, said volume being at least three times the plasma chamber volume with said flow restriction structure spaced one chamber diameter from said coil and being equal to a uniform dimensional extension of said plasma chamber when said flow restriction structure is spaced at least three chamber diameters from the downstream end of said coil.
Claim 8
Dependent Claim
71 words
The system as claimed in claim 6 wherein said chamber defining structure includes a first tubular structure and further including a second tubular structure coaxially aligned with, surrounding and spaced from said first tubular structure so that an annular intermediate chamber is defined and means to supply fluid under pressure to said intermediate chamber, to maintain the pressure in said intermediate chamber at least one-third the pressure in said plasma chamber.
Claim 9
Dependent Claim
26 words
The system as claimed in claim 7 wherein said gas flow through said chamber is correlated with the three-fourths power of the chamber pressure in atmospheres.
References Cited (Backward Citations)
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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) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |