US3284657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grain-oriented thermionic emitter for electron discharge devices
Assignee: Varian Medical Systems Inc
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Filing: 1963-06-03
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Granted: 1966-11-08
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Expires: 1983-06-03
Abstract
No abstract record available.
Inventors
- 👤 Weissman Ira
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:28
CPC Classifications
H; H01; H01J; H01J45/00; H01J1/00; H01J1/02; H01J1/13; H01J1/14; H01J1/20; H01J1/28; H01J3/00; H01J3/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
A THERMIONIC EMITTER ADAPTED TO OPERATE AT ELEVATED TEMPERATURE COMPRISING, A BODY OF HIGH MELTING POINT MATERIAL HAVING AT LEAST ONE SURFACE PORTION ADAPTED TO ACT AS AN ELECTRON EMISSIVE SURFACE, AND SAID ELECTRON EMISSIVE SURFACE BEING CONSTITUTED OF A GRAIN ORIENTED POLYCRYSTALLINE MATERIAL.
Claim 2
Dependent Claim
44 words
A THERMIONIC EMITTER ADAPTED TO OPERATE AT ELEVATED TEMPERATURE COMPRISING, A BODY OF HIGH MELTING POINT MATERIAL HAVING AT LEAST ONE SURFACE PORTION ADAPTED TO ACT AS AN ELECTRON EMISSIVE SURFACE, AND SAID ELECTRON EMISSIVE SURFACE BEING CONSTITUTED OF A GRAIN ORIENTED POLYCRYSTALLINE MATERIAL.
References Cited (Backward Citations)
US1559799A
Cited
US1602526A
Cited
US1585497A
Cited
US1826514A
Cited
US2808530A
Cited
US2750527A
Cited
US3010046A
Cited
US2895070A
Cited
US3138725A
Cited
US2987390A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-07 | 1970-05-09 | 1970-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-07 | 1974-05-09 | 1974-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-07 | 1978-05-09 | 1978-11-08 | $7700.00 | Window Closed / Lapsed |