US4447761A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Negative ion generator
Assignee: United States Department of Energy
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Filing: 1982-02-11
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Granted: 1984-05-08
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Expires: 2002-02-11
Abstract
Abstract A negative ion generator is formed from a magnetically insulated transmission line having a coating of graphite on the cathode for producing negative ions and a plurality of apertures on the opposed anode for the release of negative ions. Magnetic insulation keeps electrons from flowing from the cathode to the anode. A transverse magnetic field removes electrons which do escape through the apertures from the trajectory of the negative ions.
Inventors
- 👤 Regan W. Stinnett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:10
CPC Classifications
H; H01; H01J; H01J27/00; H01J27/02; H01J27/028
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
66 words
A negative ion generator comprising: a magnetically insulated transmission line including an elongate cathode having an emitting surface facing an elongate anode across a gap, said emitting surface having coating means for producing negative ions, and said anode having aperture means for the passage of negative ions; and magnetic means for deflecting electrons which pass through said aperture without significantly effecting the flight of negative ions.
Claim 2
Dependent Claim
66 words
A negative ion generator comprising: a magnetically insulated transmission line including an elongate cathode having an emitting surface facing an elongate anode across a gap, said emitting surface having coating means for producing negative ions, and said anode having aperture means for the passage of negative ions; and magnetic means for deflecting electrons which pass through said aperture without significantly effecting the flight of negative ions.
Claim 3
Dependent Claim
22 words
The negative ion generator of claim 1 wherein the emitting surface of said cathode conforms to the facing surface of said anode.
Claim 4
Dependent Claim
20 words
The negative ion generator of claim 2 wherein said aperture means comprises a plurality of apertures distributed along said anode.
Claim 5
Dependent Claim
18 words
The negative ion generator of claim 3 wherein said emitting surface and said facing surface are parallel planes.
Claim 6
Dependent Claim
13 words
The negative ion generator of claim 3 wherein said emitting surface is concave.
Claim 7
Dependent Claim
24 words
The negative ion generator of claim 5 wherein the elongate axis of said cathode is straight, the negative ions being focused onto a line.
Claim 8
Dependent Claim
24 words
The negative ion generator of claim 5 wherein the elongate axis of said cathode is arcuate, the negative ions being focused onto a point.
Claim 9
Dependent Claim
13 words
The negative ion generator of claim 1 wherein said coating means comprises graphite.
Claim 10
Dependent Claim
33 words
The negative ion generator of claim 1 further including a high voltage pulse generator connected at one end of said transmission line and a load connected to the other end of said line.
Claim 11
Dependent Claim
27 words
The negative ion generator of claim 1 wherein said aperture means comprises at least one round aperture having a diameter of approximately 20% of the gap spacing.
References Cited (Backward Citations)
US4045677A
Cited
US4298798A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-08 | 1987-11-07 | 1988-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-08 | 1991-11-07 | 1992-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-08 | 1995-11-07 | 1996-05-08 | $7700.00 | Window Closed / Lapsed |