US2569847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-frequency tetrode with built-in capacitor
Assignee: Varian Medical Systems Inc
•
Filing: 1949-04-08
•
Granted: 1951-10-02
•
Expires: 1969-04-08
Abstract
No abstract record available.
Inventors
- 👤 William W Eitel
- 👤 Jack A Mccullough
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:30
CPC Classifications
H; H01; H01J; H01J19/00; H01J19/78; H01J21/00; H01J21/02; H01J21/06; H01J21/065
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2342897A
Cited
US2256293A
Cited
US2396167A
Cited
US2453148A
Cited
US2446379A
Cited
US2455851A
Cited
US2489873A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-01 | 1955-04-02 | 1955-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-01 | 1959-04-02 | 1959-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-01 | 1963-04-02 | 1963-10-02 | $7700.00 | Window Closed / Lapsed |