Patent US2813995A successfully refreshed from Google Patents.
US2813995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode and method of manufacture
Assignee: General Electric Co
•
Filing: 1953-10-14
•
Granted: 1957-11-19
•
Expires: 1973-10-14
Abstract
No abstract record available.
Inventors
- 👤 Bernard N Watts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:46
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/04; H01J9/042; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10S428/926; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12611; Y10T428/12771; Y10T428/12806; Y10T428/12826; Y10T428/1284; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/296; Y10T428/298
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
A CATHODE FOR AN ELECTRIC DISCHARGE DEVICE COMPRISING A TUNGSTEN BASE MEMBER HAVING THEREON A SURFCE LAYER OF A SILICIDE OF TUNGSTEN FORMED IN SITU AS THE REACTION PRODUCT OF THE TUNGSTEN BASE MEMBER WITH SILICON AND A COATING THEREON OF ALKALINE EARTH OXIDE.
Claim 2
Dependent Claim
44 words
A CATHODE FOR AN ELECTRIC DISCHARGE DEVICE COMPRISING A TUNGSTEN BASE MEMBER HAVING THEREON A SURFCE LAYER OF A SILICIDE OF TUNGSTEN FORMED IN SITU AS THE REACTION PRODUCT OF THE TUNGSTEN BASE MEMBER WITH SILICON AND A COATING THEREON OF ALKALINE EARTH OXIDE.
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) | 1960-11-18 | 1961-05-20 | 1961-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-18 | 1965-05-20 | 1965-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-18 | 1969-05-20 | 1969-11-19 | $7700.00 | Window Closed / Lapsed |