US3081020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion pumps
Assignee: Compagnie Francaise Thomson Houston SA
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Filing: 1959-02-06
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Granted: 1963-03-12
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Expires: 1979-02-06
Abstract
No abstract record available.
Inventors
- 👤 Rostas Ernest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:45
CPC Classifications
H; H01; H01J; H01J41/00; H01J41/12; H01J41/18; H01J41/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
154 words
AN ION PUMP IN WHICH A GAS TO BE PUMPED IS IONIZED AND THE PLASMA SUBJECTED TO AN ELECTRIC FIELD INTENDED TO DRAW OFF THE IONS, SAID PUMP COMPRISING A DISCHARGE STRUCTURE CONSTITUTED BY TWO SPACED GENERALLY CYLINDRICAL ELECTRODES COAXIALLY ARRANGED ONE WITHIN THE OTHER, A CASING, WHICH INCLUDES THE EXTERNAL ELECTRODE, ENCLOSING THE SPACE BETWEEN SAID TWO ELECTRODES, THE INNER OF SAID ELECTRODES HAVING A SECONDARY EMISSION COEFFICIENT HIGHER THAN UNITY, MEANS FOR APPLYING A VOLTAGE TO SAID INNER ELECTRODE WHEREBY IT IS BROUGHT TO A NEGATIVE POTENTIAL RELATIVE TO THE EXTERNAL ELECTRODE, MAGNET MEANS FOR PRODUCING A MAGNETIC FIELD SUBSTANTIALLY PARALLEL TO THE AXIS OF THE STRUCTURE AND HAVING A STRENGTH SUCH THAT FOR THE POTENTIAL APPLIED TO THE ELECTRODES A CASCADE DISCHARGE BY SECONDARY ELECTRONS MAY BE ESTABLISHED BETWEEN THE ELECTRODES, AND AN INLET EXTENDING THROUGH SAID CASING FOR FEEDING A GAS TO BE PUMPED TO THE SPACE BETWEEN SAID ELECTRODES,
Claim 2
Dependent Claim
154 words
AN ION PUMP IN WHICH A GAS TO BE PUMPED IS IONIZED AND THE PLASMA SUBJECTED TO AN ELECTRIC FIELD INTENDED TO DRAW OFF THE IONS, SAID PUMP COMPRISING A DISCHARGE STRUCTURE CONSTITUTED BY TWO SPACED GENERALLY CYLINDRICAL ELECTRODES COAXIALLY ARRANGED ONE WITHIN THE OTHER, A CASING, WHICH INCLUDES THE EXTERNAL ELECTRODE, ENCLOSING THE SPACE BETWEEN SAID TWO ELECTRODES, THE INNER OF SAID ELECTRODES HAVING A SECONDARY EMISSION COEFFICIENT HIGHER THAN UNITY, MEANS FOR APPLYING A VOLTAGE TO SAID INNER ELECTRODE WHEREBY IT IS BROUGHT TO A NEGATIVE POTENTIAL RELATIVE TO THE EXTERNAL ELECTRODE, MAGNET MEANS FOR PRODUCING A MAGNETIC FIELD SUBSTANTIALLY PARALLEL TO THE AXIS OF THE STRUCTURE AND HAVING A STRENGTH SUCH THAT FOR THE POTENTIAL APPLIED TO THE ELECTRODES A CASCADE DISCHARGE BY SECONDARY ELECTRONS MAY BE ESTABLISHED BETWEEN THE ELECTRODES, AND AN INLET EXTENDING THROUGH SAID CASING FOR FEEDING A GAS TO BE PUMPED TO THE SPACE BETWEEN SAID ELECTRODES,
References Cited (Backward Citations)
US2755014A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-03-11 | 1966-09-10 | 1967-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-03-11 | 1970-09-10 | 1971-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-03-11 | 1974-09-10 | 1975-03-12 | $7700.00 | Window Closed / Lapsed |