Patent US6402806B1 successfully refreshed from Google Patents.
Patent US2497090A successfully refreshed from Google Patents.
US2497090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrode and method of making the same
Assignee: Varian Medical Systems Inc
•
Filing: 1947-12-13
•
Granted: 1950-02-14
•
Expires: 1967-12-13
Abstract
No abstract record available.
Inventors
- 👤 Harold D Miller
- 👤 Paul D Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:55
CPC Classifications
H; H01; H01J; H01J19/00; H01J19/28; H01J19/30; H01J2893/00; H01J2893/0001; H01J2893/0012; H01J2893/0019; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/934; Y10S428/935; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12049; Y10T428/12056; Y10T428/12063; Y10T428/12069; Y10T428/12076; Y10T428/12083; Y10T428/12139; Y10T428/12493; Y10T428/12535; Y10T428/12542; Y10T428/12576; Y10T428/12771; Y10T428/12806; Y10T428/12826; Y10T428/12861; Y10T428/12875
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
30 words
A GRID MATERIAL FOR AN ELECTRON TUBE COMPRISING A CORE OF MOLYBEDENUM, AN INNER LAYER OF MOLYBDENUM CARBIDE, AN INTERMEDIATE LAYER OF PLATINUM, AND A SURFACE LAYER COMPRISING ZIRCONIUM CARBIDE.
References Cited (Backward Citations)
US1236383A
Cited
US1667471A
Cited
US1813842A
Cited
US1791968A
Cited
GB356671A
Cited
US2091554A
Cited
US2294562A
Cited
US2282097A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-02-13 | 1953-08-15 | 1954-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-13 | 1957-08-15 | 1958-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-13 | 1961-08-15 | 1962-02-14 | $7700.00 | Window Closed / Lapsed |