Patent US5569976A successfully refreshed from Google Patents.
US5569976A
Expired / Lapsed
US
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Ion emmiter based on cold cathode discharge
Assignee: Individual
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Filing: 1995-06-14
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Granted: 1996-10-29
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Expires: 2015-06-14
Abstract
Abstract The emitter includes hollow cylindrical cathode, which has a multi-apertured emission window at one end, and a coaxial rod-shaped anode at the other end, mounted with a feed-through insulator. A magnetic coil is mounted coaxially on the outside of the cathode and creates a magnetic field. The cathode has an internal open chamber or space filled with a gas and with the applying of a voltage between the cathode and anode the gas discharge starts. The ions are extracted from the gas discharge plasma through the emission window.
Inventors
- 👤 Nikolai V. Gavrilov
- 👤 Sergey P. Nikulin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:13
CPC Classifications
H; H01; H01J; H01J27/00; H01J27/02; H01J27/08; H01J27/14
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
143 words
A cold cathode plasma emitter for producing ions comprising: a cylindrical cathode having an internal cavity with a first and second end with an ion emission window at said first end, said cavity containing a plasma producing gas, said cathode dimensions selected from the following ratios: L/D=0.8 to 1.2; L is the length of said internal cavity and D is the diameter of said internal cavity; a rod-shaped anode, mounted coaxially with the center line of said cavity positioned within the cavity, said anode length l selected from the following ratio I/L=0.5 to 0.8; a pulse power supply connected to said cathode and an anode; a feedthrough insulator positioned between said cathode and said anode for electrical insulation therebetween; and a magnetic coil, mounted externally of the cathode and coaxially with said longitudinal center line of said cavity for producing a magnetic field.
Claim 2
Dependent Claim
143 words
A cold cathode plasma emitter for producing ions comprising: a cylindrical cathode having an internal cavity with a first and second end with an ion emission window at said first end, said cavity containing a plasma producing gas, said cathode dimensions selected from the following ratios: L/D=0.8 to 1.2; L is the length of said internal cavity and D is the diameter of said internal cavity; a rod-shaped anode, mounted coaxially with the center line of said cavity positioned within the cavity, said anode length l selected from the following ratio I/L=0.5 to 0.8; a pulse power supply connected to said cathode and an anode; a feedthrough insulator positioned between said cathode and said anode for electrical insulation therebetween; and a magnetic coil, mounted externally of the cathode and coaxially with said longitudinal center line of said cavity for producing a magnetic field.
Claim 3
Dependent Claim
37 words
The invention as defined in claim 1 wherein said plasma producing gas is selected from the group of gases consisting of C 3 H 8 , N 2 , NH 3 , Ar and O 2 .
Claim 4
Dependent Claim
21 words
The invention as defined in claim 1 wherein said plasma producing gas is pressurized between 10 -2 and 10 -1 Pa.
Claim 5
Dependent Claim
31 words
The invention as defined in claim 1 wherein the open circuit voltage of said power supply is to 1.8 kV with a pulse width from 10 microseconds up to continuous mode.
Claim 6
Dependent Claim
17 words
The invention as defined in claim 1 wherein the optimal cavity ratio is L=D and l=0.65 L.
Claim 7
Dependent Claim
32 words
The invention as defined in claim 1 wherein said magnetic coil has a magnetic field of approximately 10 -3 T when D=15 cm, said magnetic field changing approximately inversely proportionally to D.
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) | 1999-10-29 | 2000-04-29 | 2000-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-10-29 | 2004-04-29 | 2004-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-10-29 | 2008-04-29 | 2008-10-29 | $7700.00 | Window Closed / Lapsed |