Patent US3239715A successfully refreshed from Google Patents.
US3239715A
Expired / Lapsed
US
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Electron emission monitor for magnetron-type ionization gauge
Assignee: General Electric Co
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Filing: 1961-09-26
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Granted: 1966-03-08
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Expires: 1981-09-26
Abstract
No abstract record available.
Inventors
- 👤 James M Lafferty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:08
CPC Classifications
H; H01; H01J; H01J41/00; H01J41/02; H01J41/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
IN A MAGNETRON-TYPE ION SOURCE HAVING AN ELECTRON EMITTER, AN ANODE IN CLOSE JUXTAPOSITION WITH SAID ELECTRON EMITTER, AND ELECTRICAL BIAS AND MAGNETIC FIELD MEANS FOR OPERATING SAID ION SOURCE BEYOND CUT-OFF CONDITIONS WHEREBY THE ELECTRONS FROM SAID ELECTRON EMITTER FIAL TO REACH SAID ANODE AND FORM A ROTATING SPACED CHARGE CLOUD SURROUNDING SAID ELECTRON EMITTER, THE IMPROVEMENT COMPRISING: AN ELECTRON COLLECTING ELECTRODE MEMBER IN JUXTAPOSITION TO SAID ELECTRON EMITTER AND DISPOSED WITHIN SAID ROTATING SPACE CHARGE CLOUD FOR MONITORING THE ELECTRON CURRENT IN SAID ION SOURCE, SAID ELECTRODE MEMBER BEING SMALL RELATIVE TO SAID SPACE CHARGE CLOUD TO REDUCE ION COLLECTION THEREBY.
Claim 2
Dependent Claim
103 words
IN A MAGNETRON-TYPE ION SOURCE HAVING AN ELECTRON EMITTER, AN ANODE IN CLOSE JUXTAPOSITION WITH SAID ELECTRON EMITTER, AND ELECTRICAL BIAS AND MAGNETIC FIELD MEANS FOR OPERATING SAID ION SOURCE BEYOND CUT-OFF CONDITIONS WHEREBY THE ELECTRONS FROM SAID ELECTRON EMITTER FIAL TO REACH SAID ANODE AND FORM A ROTATING SPACED CHARGE CLOUD SURROUNDING SAID ELECTRON EMITTER, THE IMPROVEMENT COMPRISING: AN ELECTRON COLLECTING ELECTRODE MEMBER IN JUXTAPOSITION TO SAID ELECTRON EMITTER AND DISPOSED WITHIN SAID ROTATING SPACE CHARGE CLOUD FOR MONITORING THE ELECTRON CURRENT IN SAID ION SOURCE, SAID ELECTRODE MEMBER BEING SMALL RELATIVE TO SAID SPACE CHARGE CLOUD TO REDUCE ION COLLECTION THEREBY.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-07 | 1969-09-06 | 1970-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-07 | 1973-09-06 | 1974-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-07 | 1977-09-06 | 1978-03-08 | $7700.00 | Window Closed / Lapsed |