US2659685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boride cathodes
Assignee: General Electric Co
•
Filing: 1950-08-08
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Granted: 1953-11-17
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Expires: 1970-08-08
Abstract
No abstract record available.
Inventors
- 👤 James M Lafferty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:26
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/14; H01J1/148; C; C25; C25C; C25C7/00; C25C7/02; H01J17/00; H01J17/02; H01J17/04; H01J17/06; H01J17/066; H01J2893/00; H01J2893/0064; H01J2893/0065; H01J2893/0066; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12576; Y10T428/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
A CATHODE COMPRISING A REFRACTORY METAL CORE, AN ELECTRON EMISSIVE COATING THEREON CONSISTING ESSENTIALLY OF A RARE EARTH METAL BORIDE AND AN INTERPOSED LAYER INCLUDING THE CARBIDE OF THE CORE METAL FOR MINIMIZING THE DIFFUSION OF BORON FROM THE COATING INTO THE CORE METAL.
Claim 2
Dependent Claim
44 words
A CATHODE COMPRISING A REFRACTORY METAL CORE, AN ELECTRON EMISSIVE COATING THEREON CONSISTING ESSENTIALLY OF A RARE EARTH METAL BORIDE AND AN INTERPOSED LAYER INCLUDING THE CARBIDE OF THE CORE METAL FOR MINIMIZING THE DIFFUSION OF BORON FROM THE COATING INTO THE CORE METAL.
References Cited (Backward Citations)
US2447973A
Cited
US2438732A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-16 | 1957-05-18 | 1957-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-16 | 1961-05-18 | 1961-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-16 | 1965-05-18 | 1965-11-17 | $7700.00 | Window Closed / Lapsed |