US3227911A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Indirectly heated cathodes
Assignee: Varian Medical Systems Inc
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Filing: 1963-10-24
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Granted: 1966-01-04
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Expires: 1983-10-24
Abstract
No abstract record available.
Inventors
- 👤 Heil Oskar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:52
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J1/24
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
134 words
AN INDIRECTLY HEATED CATHODE COMPRISING A METAL BODY HAVING AN EMISSIVE SURFACE, A HEATER ASSEMBLY IN THERMAL CONTACT WITH SAID METAL BODY AND LOCATED ADJACENT SAID EMISSIVE SURFACE, AND A METAL MATERIAL ATTACHED TO SAID METAL BODY AND ENCASING SAID HEATING ASSEMBLY, SAID METAL MATERIAL CAPABLE OF FOLLOWING THE EXPANDING AND CONTACTING MOTIONS OF SAID METAL BODY AND SAID HEATER ASSEMBLY AND INCLUDING 65 TO 90% BY VOLUME OF 10 TO 150 MICRO SIZE SPHERES OF A FIRST METAL SELECTED FROM THE GROUP CONSISTING OF MOLYBDENUM, PALLADIUM AND NICKEL AND WHICH ARE BONDED TOGETHER BY 35 TO 5% BY VOLUME OF A SECOND METAL WHICH FORMS AN ALLOY WITH SAID MOCROSPHERES, AND SAID SPHERES BEING BONDED TOGETHER ALNG A PORTION OF THEIR PERIPHERIES BY A EUTECTIC ALLOY OF SAID SPHERES WITH SAID SECOND METAL.
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) | 1969-01-03 | 1969-07-05 | 1970-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-03 | 1973-07-05 | 1974-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-03 | 1977-07-05 | 1978-01-04 | $7700.00 | Window Closed / Lapsed |