US4339782A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Supersonic jet ionizer
Assignee: FLAKTAIR Inc
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Filing: 1980-03-27
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Granted: 1982-07-13
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Expires: 2000-03-27
Abstract
Abstract A supersonic jet ionizer (10) comprises dielectric structure defining a chamber (30) for receiving pressurized gas and a convergent-divergent nozzle (31) for causing the gas to issue from the chamber (30) in a jet at supersonic velocity. A high-voltage electrode tip (51) and a grounded metallic ring (60) are mounted in a diverging region (41) of the nozzle (31) so that a corona can be maintained in the diverging region (41). Ions formed in the corona are swept out of the nozzle (31) by the supersonic gas jet. The supersonic jet ionizer (10) can be utilized as a particulate charging means in a system (75) for filtering charged particulates from a particulate-laden gas stream.
Inventors
- 👤 Henry H. S. Yu
- 👤 Richard K. Teague
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:58
CPC Classifications
H; H01; H01T; H01T19/00; H01T19/04; H01T23/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
147 words
A supersonic jet ionizer comprising: (a) an electrode connectable to a high-voltage power supply; (b) a dielectric structure defining a chamber and a nozzle, said nozzle being in gas-flow communication with said chamber, said dielectric structure having a first channel for admission of a pressurized gas into said chamber, said nozzle being configured to enable said gas to exit from said chamber by passing initially through a region of narrowing cross-sectional area and thereafter through a region of widening cross-sectional area, said dielectric structure having a second channel for insertion of a tip of said high-voltage electrode into said region of widening cross-sectional area; and (c) an electrically conductive member mounted in said region of widening cross-sectional area of said nozzle, said electrically conductive member being connectable to ground potential so that an electric field can be maintained between said high-voltage electrode and said electrically conductive member.
Claim 2
Dependent Claim
147 words
A supersonic jet ionizer comprising: (a) an electrode connectable to a high-voltage power supply; (b) a dielectric structure defining a chamber and a nozzle, said nozzle being in gas-flow communication with said chamber, said dielectric structure having a first channel for admission of a pressurized gas into said chamber, said nozzle being configured to enable said gas to exit from said chamber by passing initially through a region of narrowing cross-sectional area and thereafter through a region of widening cross-sectional area, said dielectric structure having a second channel for insertion of a tip of said high-voltage electrode into said region of widening cross-sectional area; and (c) an electrically conductive member mounted in said region of widening cross-sectional area of said nozzle, said electrically conductive member being connectable to ground potential so that an electric field can be maintained between said high-voltage electrode and said electrically conductive member.
Claim 3
Dependent Claim
30 words
The supersonic jet ionizer of claim 1 wherein said chamber defined by said dielectric structure is of substantially cylindrical configuration, said nozzle communicating with a first end of said chamber.
Claim 4
Dependent Claim
30 words
The supersonic jet ionizer of claim 2 wherein said grounded electrically conductive member is of annular configuration, and is positioned circumjacent said region of widening cross-sectional area of said nozzle.
Claim 5
Dependent Claim
54 words
The supersonic jet ionizer of claim 3 wherein said grounded electrically conductive member is sandwiched between and bonded to said dielectric structure and an annular dielectric member, said grounded electrically conductive member and said annular dielectric member being configured to provide a smooth-walled continuation of said region of widening cross-sectional area of said nozzle.
Claim 6
Dependent Claim
34 words
The supersonic jet ionizer of claim 2 wherein said chamber is of generally circular cylindrical configuration, said nozzle being substantially symmetric about an axis that is coincident with the cylindrical axis of said chamber.
Claim 7
Dependent Claim
60 words
The supersonic jet ionizer of claim 5 wherein said dielectric structure comprises first and second open-ended cylindrical members, said first member being configured to define said chamber and said nozzle, said second member being configured to define said second channel, said first and second members being coupled so that said second channel is coaxial with said chamber and said nozzle.
Claim 8
Dependent Claim
24 words
The supersonic jet ionizer of claim 6 wherein said first and second members of said dielectric structure are coupled by a screw thread connection.
Claim 9
Dependent Claim
67 words
The supersonic jet ionizer of claim 5 wherein said high-voltage electrode is elongate, and wherein said second channel extends into said dielectric structure along the cylindrical axis of said chamber so that said high-voltage electrode can be inserted through said second channel to a position at which said tip of said high-voltage electrode lies on said axis in said region of widening cross-sectional area of said nozzle.
Claim 10
Dependent Claim
26 words
The supersonic jet ionizer of claim 8 wherein said first channel extends into said dielectric structure radially with respect to the cylindrical axis of said chamber.
References Cited (Backward Citations)
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Cited
US2822058A
Cited
US3317790A
Cited
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Cited
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Cited
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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) | 1985-07-12 | 1986-01-11 | 1986-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-12 | 1990-01-11 | 1990-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-12 | 1994-01-11 | 1994-07-13 | $7700.00 | Window Closed / Lapsed |