US3171081A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ionization vacuum gauge
Assignee: Individual
•
Filing: 1962-02-19
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Granted: 1965-02-23
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Expires: 1982-02-19
Abstract
No abstract record available.
Inventors
- 👤 Donald C Garwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:35
CPC Classifications
H; H01; H01J; H01J41/00; H01J41/02; H01J41/06
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
177 words
AN IMPROVED IONIZATION VACUUM GAUGE COMPRISING A CONDUCTIVE HOLLOW CYLINDER, A CONDUCTIVE END PLATE FOR SAID HOLLOW CYLINDER, MEANS SUPPORTING SAID CONDUCTIVE END PLATE INSULATINGLY FROM SAID HOLLOW CYLINDER, A CENTRAL ELECTRODE MEANS FOR INSULATINGLY SUPPORTING SAID CENTRAL ELECTRODE MEANS FOR INSULATINGLY SUPPORTING SAID A FIRST SOURCE OF POTENTIAL, A SWITCH, MEANS CONNECTING SAID SWITCH AND FIRST SOURCE OF POTENTIAL IN SERIES, MEANS CONNECTING SAID SERIALLY CONNECTED SWITCH AND FIRST SOURCE OF POTENTIAL ACROSS OPPOSITE ENDS OF SAID CENTRAL ELECTRODE FOR THE PURPOSE OF HEATING SAID CENTRAL ELECTRODE TO EMIT ELECTRONS FOR INITIATING OPERATION OF SAID VACUUM GAUGE, A SECOND AND THIRD SOURCE OF POTENTIAL, MEANS CONNECTING ONE END OF SAID SECOND SOURCE OF POTENTIAL TO ONE END OF SAID THIRD SOURCE OF POTENTIAL, MEANS CONNECTING SAID END PLATE TO THE JUNCTION OF SAID SECOND AND THIRD SOURCES OF POTENTIAL, MEANS CONNECTING THE OTHER END OF SAID THIRD SOURCE OF POTENTIAL TO SAID CYLINDER, A CURRENT-MEASURING DEVICE, AND MEANS CONNECTING SAID CURRENTMEASURING DEVICE BETWEEN SAID CENTRAL ELECTRODE AND THE OTHER END OF SAID SECOND SOURCE OF POTENTIAL.
References Cited (Backward Citations)
US2817030A
Cited
US2884550A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-02-23 | 1968-08-24 | 1969-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-23 | 1972-08-24 | 1973-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-23 | 1976-08-24 | 1977-02-23 | $7700.00 | Window Closed / Lapsed |