US2715993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ionization pump
Assignee: W M WELCH MANUFACTURING Co
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Filing: 1952-06-06
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Granted: 1955-08-23
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Expires: 1972-06-06
Abstract
No abstract record available.
Inventors
- 👤 Jerome R Batina
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:39
CPC Classifications
H; H01; H01J; H01J41/00; H01J41/12; H01J41/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
172 words
AN IONIZATION VACUUM PUMP COMPRISING A CASING DEFINING A SEALED, AIR-TIGHT PUMPING CHAMBER, WHICH CHAMBER HAS A GAS INTAKE OPENING ADAPTED TO BE CONNECTED TO A SPACE TO BE EVACUATED AND A GAS DISCHARGE OPENING TO THE EXTERIOR OF SAID CASING, A PAIR OF SPACED ELECTRODES MOUNTED IN SAID CHAMBER AT OPPOSITE ENDS OF A PATH OF ELECTRON FLOW THERETHROUGH, CONDUCTORS CONNECTED TO SAID ELECTRODES AND EXTENDING THROUGH SAID CASING IN SEALED RELATION THERETO, WHICH CONDUCTORS ARE ADAPTED TO CONNECT SAID ELECTRODES WITH TERMINALS OF AN EXTERNAL VOLTAGE SOURCE AND THEREBY CAUSE IONIZATION OF MOLECULES IN SAID CHAMBER BY ELECTRON FLOW ALONG SAID PATH, FOLLOWED BY ATTRACTION OF IONIZED PARTICLES TO ONE OF THE ELECTRODES AND ELECTRICAL DISCHARGE THEREOF, AND AN INDEPENDENT SOURCE OF EMISSION OF RADIOACTIVE PARTICLES LOCATED BETWEEN SAID ELECTRODES, SAID SOURCE BEING SUFFICIENTLY CLOSELY ADJACENT SAID ELECTRON FLOW PATH TO SUPPLEMENT THE IONIZATION IN SAID CHAMBER CREATED BY SAID ELECTRODES, WHICH INDEPENDENT SOURCE BECOMES THE PREDOMINANT SOURCE OF IONIZATION UNDER AN EXTREMELY HIGH DEGREE OF EVACUATION OF SAID CHAMBER.
Claim 2
Dependent Claim
172 words
AN IONIZATION VACUUM PUMP COMPRISING A CASING DEFINING A SEALED, AIR-TIGHT PUMPING CHAMBER, WHICH CHAMBER HAS A GAS INTAKE OPENING ADAPTED TO BE CONNECTED TO A SPACE TO BE EVACUATED AND A GAS DISCHARGE OPENING TO THE EXTERIOR OF SAID CASING, A PAIR OF SPACED ELECTRODES MOUNTED IN SAID CHAMBER AT OPPOSITE ENDS OF A PATH OF ELECTRON FLOW THERETHROUGH, CONDUCTORS CONNECTED TO SAID ELECTRODES AND EXTENDING THROUGH SAID CASING IN SEALED RELATION THERETO, WHICH CONDUCTORS ARE ADAPTED TO CONNECT SAID ELECTRODES WITH TERMINALS OF AN EXTERNAL VOLTAGE SOURCE AND THEREBY CAUSE IONIZATION OF MOLECULES IN SAID CHAMBER BY ELECTRON FLOW ALONG SAID PATH, FOLLOWED BY ATTRACTION OF IONIZED PARTICLES TO ONE OF THE ELECTRODES AND ELECTRICAL DISCHARGE THEREOF, AND AN INDEPENDENT SOURCE OF EMISSION OF RADIOACTIVE PARTICLES LOCATED BETWEEN SAID ELECTRODES, SAID SOURCE BEING SUFFICIENTLY CLOSELY ADJACENT SAID ELECTRON FLOW PATH TO SUPPLEMENT THE IONIZATION IN SAID CHAMBER CREATED BY SAID ELECTRODES, WHICH INDEPENDENT SOURCE BECOMES THE PREDOMINANT SOURCE OF IONIZATION UNDER AN EXTREMELY HIGH DEGREE OF EVACUATION OF SAID CHAMBER.
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) | 1958-08-22 | 1959-02-21 | 1959-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-08-22 | 1963-02-21 | 1963-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-08-22 | 1967-02-21 | 1967-08-23 | $7700.00 | Window Closed / Lapsed |