Patent US3860921A successfully refreshed from Google Patents.
US2754445A
Expired / Lapsed
US
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Ceramic vacuum tube
Assignee: Varian Medical Systems Inc
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Filing: 1952-08-01
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Granted: 1956-07-10
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Expires: 1972-08-01
Abstract
No abstract record available.
Inventors
- 👤 Harold E Sorg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:11
CPC Classifications
H; H01; H01J; H01J21/00; H01J21/36; H01J5/00; H01J5/20; H01J5/22; H01J5/24; H01J5/32; H01J5/44; H01J2893/00; H01J2893/0033; H01J2893/0037; H01J2893/0038
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
AN ELECTRON TUBE COMPRISING A GENERALLY CYLINDRICAL ENVELOPE HAVING UPPER AND LOWER DISK-SHAPED END WALLS OF CERAMIC, A CYLINDRICAL SIDE WALL OF CERAMIC FITTED TO THE END WALLS ALONG UPPER AND LOWER JOINTS, METALLIC BONDS UNITING THE CERAMIC PARTS TOGETHER AT SAID JOINTS, THE INNER FACE OF THE UPPER CERAMIC WALL BEING METALIZED, PROVIDING AN ANODE, A CATHODE SUPPORTED ON THE LOWER WALL AND HAVING AN ELECTRON EMITTING SURFACE FACING THE ANODE, THE METALLIC BOND AT THE UPPER JOINT PROVIDING A LEAD-IN CONDUCTOR FOR THE ANODE AND THE METALLIC BOND AT THE LOWER
Claim 2
Dependent Claim
93 words
AN ELECTRON TUBE COMPRISING A GENERALLY CYLINDRICAL ENVELOPE HAVING UPPER AND LOWER DISK-SHAPED END WALLS OF CERAMIC, A CYLINDRICAL SIDE WALL OF CERAMIC FITTED TO THE END WALLS ALONG UPPER AND LOWER JOINTS, METALLIC BONDS UNITING THE CERAMIC PARTS TOGETHER AT SAID JOINTS, THE INNER FACE OF THE UPPER CERAMIC WALL BEING METALIZED, PROVIDING AN ANODE, A CATHODE SUPPORTED ON THE LOWER WALL AND HAVING AN ELECTRON EMITTING SURFACE FACING THE ANODE, THE METALLIC BOND AT THE UPPER JOINT PROVIDING A LEAD-IN CONDUCTOR FOR THE ANODE AND THE METALLIC BOND AT THE LOWER
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) | 1959-07-10 | 1960-01-09 | 1960-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-10 | 1964-01-09 | 1964-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-10 | 1968-01-09 | 1968-07-10 | $7700.00 | Window Closed / Lapsed |