US3117247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum pump
Assignee: Varian Medical Systems Inc
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Filing: 1961-05-29
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Granted: 1964-01-07
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Expires: 1981-05-29
Abstract
No abstract record available.
Inventors
- 👤 Robert L Jepsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:25
CPC Classifications
H; H01; H01J; H01J41/00; H01J41/12; H01J41/18; H01J41/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
AN ELECTRICAL VACUUM APPARATUS UTILIZING THE PRINCIPLE OF PARTICLE BOMBARDMENT OF A CATHODE STRUCTURE INCLUDING, IN COMBINATION, AN ANODE STRUCTURE HAVING A PLURALITY OF GLOW DISCHARGE PASSAGEWAYS THEREIN, SAID GLOW DISCHARGE PASSAGEWAYS BEING GROUPED TRANSVERSELY TO THE LONGITUDINAL AXES OF SAID PASSAGEWAYS, A REACTIVE CATHODE STRUCTURE SPACED FROM SAID ANODE FOR PARTICLE BOMBARDMENT, A VACUUM ENVELOPE ENCLOSING SAID ANODE AND CATHODE STRUCTURES, MEANS FOR APPLYING A POTENTIAL DIFFERENCE BETWEEN SAID ANODE AND CATHODE STRUCTURES OF SUFFICIENT MAGNITUDE TO PRODUCE SIMULTANEOUS GLOW DISCHARGES WITHIN THE PLURALITY OF GLOW DISCHARGE PASSAGEWAYS AND TO BOMBARD SAID CATHODE STRUCTURE WITH POSITIVE ION PARTICLES, MAGNET MEANS FOR PRODUCING AND DIRECTING A MAGNETIC FIELD COAXIALLY OF AND WITHIN SAID GLOW DISCHARGE PASSAGEWAYS FOR ENHANCING THE GLOW DISCHARGE OF THE APPARATUS, SAID MAGNET MEANS COMPRISING A PERMANENT MAGNET AND A VACUUM SEALED CAN ENCLOSING SAID PERMANENT MAGNET, AND SAID MAGNET MEANS POSITIONED WITHIN SAID ENVELOPE.
Claim 2
Dependent Claim
148 words
AN ELECTRICAL VACUUM APPARATUS UTILIZING THE PRINCIPLE OF PARTICLE BOMBARDMENT OF A CATHODE STRUCTURE INCLUDING, IN COMBINATION, AN ANODE STRUCTURE HAVING A PLURALITY OF GLOW DISCHARGE PASSAGEWAYS THEREIN, SAID GLOW DISCHARGE PASSAGEWAYS BEING GROUPED TRANSVERSELY TO THE LONGITUDINAL AXES OF SAID PASSAGEWAYS, A REACTIVE CATHODE STRUCTURE SPACED FROM SAID ANODE FOR PARTICLE BOMBARDMENT, A VACUUM ENVELOPE ENCLOSING SAID ANODE AND CATHODE STRUCTURES, MEANS FOR APPLYING A POTENTIAL DIFFERENCE BETWEEN SAID ANODE AND CATHODE STRUCTURES OF SUFFICIENT MAGNITUDE TO PRODUCE SIMULTANEOUS GLOW DISCHARGES WITHIN THE PLURALITY OF GLOW DISCHARGE PASSAGEWAYS AND TO BOMBARD SAID CATHODE STRUCTURE WITH POSITIVE ION PARTICLES, MAGNET MEANS FOR PRODUCING AND DIRECTING A MAGNETIC FIELD COAXIALLY OF AND WITHIN SAID GLOW DISCHARGE PASSAGEWAYS FOR ENHANCING THE GLOW DISCHARGE OF THE APPARATUS, SAID MAGNET MEANS COMPRISING A PERMANENT MAGNET AND A VACUUM SEALED CAN ENCLOSING SAID PERMANENT MAGNET, AND SAID MAGNET MEANS POSITIONED WITHIN SAID ENVELOPE.
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) | 1967-01-06 | 1967-07-08 | 1968-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-01-06 | 1971-07-08 | 1972-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-01-06 | 1975-07-08 | 1976-01-07 | $7700.00 | Window Closed / Lapsed |