US3118077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ionic vacuum pumps
Assignee: National Research Development Corp UK
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Filing: 1960-11-09
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Granted: 1964-01-14
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Expires: 1980-11-09
Abstract
No abstract record available.
Inventors
- 👤 Gabor Dennis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:17
CPC Classifications
H; H01; H01J; H01J41/00; H01J41/12; H01J41/14; H01J41/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
AN IONIC VACUUM PUMPING DEVICE COMPRISING AN OUTER ELECTRODE HAVING A SURFACE OF GETTERING MATERIAL AND A ROTATIONALLY SYMMETRIC WALL DEFINING A SPACE ADAPTED TO CONTAIN GAS MOLECULES, SAID ELECTRODE BEING ADAPTED TO BE MAINTAINED AT A NEGATIVE POTENTIAL TO SERVE AS AN ION COLLECTOR, A SECOND ELECTRODE WITHIN SAID SPACE ADAPTED TO BE MAINTAINED AT A POSITIVE POTENTIAL TO SERVE AS AN ANODE, AND MEANS FOR PRODUCING IONIZING ELECTRONS, SAID MEANS COMPRISING AN ELECTRON GUN POSITIONED TO DIRECT AN ELECTRON STREAM TANGENTIALLY INTO SAID OUTER ELECTRODE, WHEREBY THE ELECTRONS ARE CAUSED TO TRAVEL IN EXTENDED PATHS WITHIN SAID SPACE WITHOUT THE AID OF A MAGNETIC FIELD.
Claim 2
Dependent Claim
107 words
AN IONIC VACUUM PUMPING DEVICE COMPRISING AN OUTER ELECTRODE HAVING A SURFACE OF GETTERING MATERIAL AND A ROTATIONALLY SYMMETRIC WALL DEFINING A SPACE ADAPTED TO CONTAIN GAS MOLECULES, SAID ELECTRODE BEING ADAPTED TO BE MAINTAINED AT A NEGATIVE POTENTIAL TO SERVE AS AN ION COLLECTOR, A SECOND ELECTRODE WITHIN SAID SPACE ADAPTED TO BE MAINTAINED AT A POSITIVE POTENTIAL TO SERVE AS AN ANODE, AND MEANS FOR PRODUCING IONIZING ELECTRONS, SAID MEANS COMPRISING AN ELECTRON GUN POSITIONED TO DIRECT AN ELECTRON STREAM TANGENTIALLY INTO SAID OUTER ELECTRODE, WHEREBY THE ELECTRONS ARE CAUSED TO TRAVEL IN EXTENDED PATHS WITHIN SAID SPACE WITHOUT THE AID OF A MAGNETIC FIELD.
References Cited (Backward Citations)
US2528541A
Cited
US2925214A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-01-13 | 1967-07-15 | 1968-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-01-13 | 1971-07-15 | 1972-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-01-13 | 1975-07-15 | 1976-01-14 | $7700.00 | Window Closed / Lapsed |