US3702416A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion source having a uniform radial density
Assignee: Individual
•
Filing: 1970-03-27
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Granted: 1972-11-07
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Expires: 1990-03-27
Abstract
Abstract The source comprises an ionization chamber into which the gas to be ionized is introduced, a cathode placed at the center of an intermediate electrode provided within an orifice for the passage of electrons, an anode provided with a hole for the passage of ions, a plasma-expansion control electrode which is electrically insulated from the anode and brought to a negative potential with respect to the anode potential, and an ion extraction electrode.
Inventors
- 👤 Lucien Bex
- 👤 Jean Faure
- 👤 Roger Vienet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:13
CPC Classifications
H; H01; H01J; H01J27/00; H01J27/02; H01J27/08; H01J27/10; H01J27/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
116 words
An ion source having a practically uniform radial density comprising an ionization chamber into which a gas to be ionized is introduced, an intermediate electrode, an anode spaced therefrom and forming with said electrode said ionization chamber, said intermediate electrode having an orifice for the passage of electrons into said chamber, a cathode upstream of said intermediate electrode facing said orifice in said intermediate electrode, said anode being downstream from said intermediate electrode, said anode having an orifice for the passage of ions therethrough, a plasma-expansion control electrode downstream of and electrically insulated from said anode and at a negative potential with respect to said anode and an ion extraction electrode downstream from said control electrode.
Claim 2
Dependent Claim
116 words
An ion source having a practically uniform radial density comprising an ionization chamber into which a gas to be ionized is introduced, an intermediate electrode, an anode spaced therefrom and forming with said electrode said ionization chamber, said intermediate electrode having an orifice for the passage of electrons into said chamber, a cathode upstream of said intermediate electrode facing said orifice in said intermediate electrode, said anode being downstream from said intermediate electrode, said anode having an orifice for the passage of ions therethrough, a plasma-expansion control electrode downstream of and electrically insulated from said anode and at a negative potential with respect to said anode and an ion extraction electrode downstream from said control electrode.
Claim 3
Dependent Claim
25 words
An ion source according to claim 1, said expansion control electrode having an internal surface of a material preventing undesirable polarization of the internal surface.
Claim 4
Dependent Claim
20 words
An ion source according to claim 1, said expansion control electrode having an internal surface coated with a gold film.
Claim 5
Dependent Claim
26 words
An ion source according to claim 1, said control electrode having an internal surface at a negative electric potential equal to that of said intermediate electrode.
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) | 1975-11-07 | 1976-05-08 | 1976-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-07 | 1980-05-08 | 1980-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-07 | 1984-05-08 | 1984-11-07 | $7700.00 | Window Closed / Lapsed |