US3204140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot cathode electron tube
Assignee: General Electric Co
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Filing: 1961-07-10
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Granted: 1965-08-31
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Expires: 1981-07-10
Abstract
No abstract record available.
Inventors
- 👤 William J Kearns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:18
CPC Classifications
H; H01; H01J; H01J17/00; H01J17/50; H01J17/52
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
A CERAMIC AND METAL GASEOUS DISCHARGE DEVICE ADAPTED FOR OPERATING AT A NORMALLY HIGH AMBIENT TEMPERATURE RANGE COMPRISING AN ENVELOPE INCLUDING A PAIR OF COAXIAL CERAMIC INSULATORS, A PAIR OF METAL END CAPS SEALED ACROSS THE OUTER ENDS OF SAID INSULATORS, ONE OF SAID END CAPS COMPRISING AN ANODE AND THE OTHER A CATHODE CONTACT, AN ANNULAR CONTACT MEMBER SEALED BETWEEN SAID INSULATORS AND INCLUDING AN INNER RIM PORTION DISPOSED IN SAID ENVELOPE, A TUBULAR METALLIC SHIELD SUPPORTED AND DIRECTLY ATTACHED TO SAID RIM PORTION OF SAID ANNULAR CONTACT MEMBER AND EXTENDING CONCENTRICALLY IN SAID ENVELOPE, A DIRECTLY-HEATED NICKELATE CATHODE DISPOSED
Claim 2
Dependent Claim
101 words
A CERAMIC AND METAL GASEOUS DISCHARGE DEVICE ADAPTED FOR OPERATING AT A NORMALLY HIGH AMBIENT TEMPERATURE RANGE COMPRISING AN ENVELOPE INCLUDING A PAIR OF COAXIAL CERAMIC INSULATORS, A PAIR OF METAL END CAPS SEALED ACROSS THE OUTER ENDS OF SAID INSULATORS, ONE OF SAID END CAPS COMPRISING AN ANODE AND THE OTHER A CATHODE CONTACT, AN ANNULAR CONTACT MEMBER SEALED BETWEEN SAID INSULATORS AND INCLUDING AN INNER RIM PORTION DISPOSED IN SAID ENVELOPE, A TUBULAR METALLIC SHIELD SUPPORTED AND DIRECTLY ATTACHED TO SAID RIM PORTION OF SAID ANNULAR CONTACT MEMBER AND EXTENDING CONCENTRICALLY IN SAID ENVELOPE, A DIRECTLY-HEATED NICKELATE CATHODE DISPOSED
References Cited (Backward Citations)
US2508979A
Cited
US2632231A
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US2489938A
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US2647218A
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US2879428A
Cited
US3023341A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-30 | 1969-03-01 | 1969-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-30 | 1973-03-01 | 1973-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-30 | 1977-03-01 | 1977-08-31 | $7700.00 | Window Closed / Lapsed |