Patent US3132274A successfully refreshed from Google Patents.
US3132274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron tube with a cathode heat dam
Assignee: Varian Medical Systems Inc
•
Filing: 1961-09-27
•
Granted: 1964-05-05
•
Expires: 1981-09-27
Abstract
No abstract record available.
Inventors
- 👤 Jr Jackson W Kendall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:19
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
AN ELECTRON TUBE HAVING AN ENVELOPE ENCLOSING CYLINDRICAL ELECTRODES INCLUDING A CATHODE, SAID CATHODE COMPRISING A CYLINDER HAVING AN ELECTRON EMISSIVE OUTER SURFACE, ANOTHER ELECTRODE CLOSELY SURROUNDING SAID CATHODE, SUPPORT MEANS FOR SAID CYLINDER COMPRISING A GENERALLY CYLINDRICAL SUPPORT MEMBER HAVING THE SAME COEFFICIENT OF EXPANSION AS SAID CATHODE CYLINDER, SAID SUPPORT MEMBER HAVING A DOWNTURNED RIM NESTED INSIDE THE LOWER END OF SAID CATHODE CYLINDER AND JOINED THERETO, A GENERALLY CYLINDRICAL HEAT DAM JOINED TO SAID SUPPORT MEMBER AND HAVING A COEFFICIENT OF EXPANSION SUBSTANTIALLY DIFFERENT FROM SAID CATHODE CYLINDER, AND MEANS SUPPORTING SAID HEAT DAM ON SAID ENVELOPE.
Claim 2
Dependent Claim
100 words
AN ELECTRON TUBE HAVING AN ENVELOPE ENCLOSING CYLINDRICAL ELECTRODES INCLUDING A CATHODE, SAID CATHODE COMPRISING A CYLINDER HAVING AN ELECTRON EMISSIVE OUTER SURFACE, ANOTHER ELECTRODE CLOSELY SURROUNDING SAID CATHODE, SUPPORT MEANS FOR SAID CYLINDER COMPRISING A GENERALLY CYLINDRICAL SUPPORT MEMBER HAVING THE SAME COEFFICIENT OF EXPANSION AS SAID CATHODE CYLINDER, SAID SUPPORT MEMBER HAVING A DOWNTURNED RIM NESTED INSIDE THE LOWER END OF SAID CATHODE CYLINDER AND JOINED THERETO, A GENERALLY CYLINDRICAL HEAT DAM JOINED TO SAID SUPPORT MEMBER AND HAVING A COEFFICIENT OF EXPANSION SUBSTANTIALLY DIFFERENT FROM SAID CATHODE CYLINDER, AND MEANS SUPPORTING SAID HEAT DAM ON 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) | 1967-05-05 | 1967-11-04 | 1968-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-05 | 1971-11-04 | 1972-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-05 | 1975-11-04 | 1976-05-05 | $7700.00 | Window Closed / Lapsed |