US3249791A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron tube and combination for sensing and regulating the cathode temperature thereof
Assignee: Varian Medical Systems Inc
•
Filing: 1963-06-12
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Granted: 1966-05-03
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Expires: 1983-06-12
Abstract
No abstract record available.
Inventors
- 👤 Jr Jackson W Kendall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:51
CPC Classifications
H; H01; H01J; H01J19/00; H01J19/74; H01J1/00; H01J1/02; H01J1/13; H01J1/135; H01J1/20; H01J1/22; H01J21/00; H01J21/02; H01J21/06; H01J21/10; H03; H03F; H03F1/00; H03F1/52; H03F1/54; H03F1/544
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
AN ELECTRON TUBE HAVING AN ENVELOPE COMPRISING A MAIN ANODE AND A FIRST TERMINAL MEANS ELECTRICALLY CONNECTED WITH SAID MAIN ANODE, A CATHODE WITHIN SAID ENVELOPE, SAID CATHODE BEING MADE OF HIGH ELECTRICAL RESISTANCE MATERIAL AND HAVING A GENERALLY CYLINDRICAL CONFIGURATION, A SECOND TERMINAL MEANS EXTENDING THROUGH SAID ENVELOPE AND ELECTRICALLY CONNECTED TO ONE END OF SAID CYLINDRICAL CATHODE, A THIRD TERMINAL MEANS EXTENDING THROUGH SAID ENVELOPE, CURRENT CARRYING MEANS ELECTRICALLY CONNECTED BETWEEN SAID THIRD TERMINAL MEANS AND THE OTHER END OF SAID CYLINDRICAL CATHODE, AN AUXILIARY ANODE LOCATED WITHIN SAID CYLINDRICAL CATHODE, AND A FOURTH TERMINAL MEANS EXTENDING THROUGH SAID ENVELOPE AND ELECTRICALLY CONNECTED TO SAID AUXILIARY ANODE.
Claim 2
Dependent Claim
109 words
AN ELECTRON TUBE HAVING AN ENVELOPE COMPRISING A MAIN ANODE AND A FIRST TERMINAL MEANS ELECTRICALLY CONNECTED WITH SAID MAIN ANODE, A CATHODE WITHIN SAID ENVELOPE, SAID CATHODE BEING MADE OF HIGH ELECTRICAL RESISTANCE MATERIAL AND HAVING A GENERALLY CYLINDRICAL CONFIGURATION, A SECOND TERMINAL MEANS EXTENDING THROUGH SAID ENVELOPE AND ELECTRICALLY CONNECTED TO ONE END OF SAID CYLINDRICAL CATHODE, A THIRD TERMINAL MEANS EXTENDING THROUGH SAID ENVELOPE, CURRENT CARRYING MEANS ELECTRICALLY CONNECTED BETWEEN SAID THIRD TERMINAL MEANS AND THE OTHER END OF SAID CYLINDRICAL CATHODE, AN AUXILIARY ANODE LOCATED WITHIN SAID CYLINDRICAL CATHODE, AND A FOURTH TERMINAL MEANS EXTENDING THROUGH SAID ENVELOPE AND ELECTRICALLY CONNECTED TO SAID AUXILIARY ANODE.
References Cited (Backward Citations)
US1963844A
Cited
US2290819A
Cited
US2459997A
Cited
US2586291A
Cited
US2687488A
Cited
US2875377A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-02 | 1969-11-01 | 1970-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-02 | 1973-11-01 | 1974-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-02 | 1977-11-01 | 1978-05-03 | $7700.00 | Window Closed / Lapsed |