US2996795A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermionic cathodes and methods of making
Assignee: General Electric Co
•
Filing: 1955-06-28
•
Granted: 1961-08-22
•
Expires: 1975-06-28
Abstract
No abstract record available.
Inventors
- 👤 Virgil L Stout
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:05
CPC Classifications
C; C23; C23C; C23C28/00; C23C28/30; C23C28/32; C23C28/325; C23C28/34; C23C28/345; H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/14; H01J9/00; H01J9/02; H01J9/04; H01J9/042; H01J9/047; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12007; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/12493; Y10T428/12535; Y10T428/12611; Y10T428/12771; Y10T428/12778; Y10T428/12861; Y10T428/12931
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
43 words
A THERMIONIC CATHODE COMPRISING A METAL BASE, A POROUS LAYER OF METAL PARTICLES ALLOYED TOGETHER AND TO SAID BASE BY A METAL SELECTED FROM THE GROUP CONSISTING OF TITANIUM, ZIRCONIUM AND TANTALUM AND AN ELECTRON EMISSIVE COATING IMPREGNATING AND OVERLYING SAID POROUS LAYER.
Claim 2
Dependent Claim
43 words
A THERMIONIC CATHODE COMPRISING A METAL BASE, A POROUS LAYER OF METAL PARTICLES ALLOYED TOGETHER AND TO SAID BASE BY A METAL SELECTED FROM THE GROUP CONSISTING OF TITANIUM, ZIRCONIUM AND TANTALUM AND AN ELECTRON EMISSIVE COATING IMPREGNATING AND OVERLYING SAID POROUS LAYER.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-21 | 1965-02-20 | 1965-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-21 | 1969-02-20 | 1969-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-21 | 1973-02-20 | 1973-08-22 | $7700.00 | Window Closed / Lapsed |