Patent US2684819A successfully refreshed from Google Patents.
Patent JPS589565A successfully refreshed from Google Patents.
Patent US4385610A successfully refreshed from Google Patents.
Patent US2424002A successfully refreshed from Google Patents.
US2424002A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-frequency electronic tube
Assignee: Research Corp
•
Filing: 1940-11-04
•
Granted: 1947-07-15
•
Expires: 1960-11-04
Abstract
No abstract record available.
Inventors
- 👤 David H Sloan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:14
CPC Classifications
H; H01; H01J; H01J19/00; H01J19/78; H01J19/80
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1888594A
Cited
US2030178A
Cited
US2086905A
Cited
US2122538A
Cited
US2199045A
Cited
US2169396A
Cited
US2187775A
Cited
US2117709A
Cited
US2220839A
Cited
US2190668A
Cited
US2197041A
Cited
US2190511A
Cited
US2207846A
Cited
US2235414A
Cited
US2289846A
Cited
US2283895A
Cited
US2280980A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-07-14 | 1951-01-13 | 1951-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-07-14 | 1955-01-13 | 1955-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-07-14 | 1959-01-13 | 1959-07-15 | $7700.00 | Window Closed / Lapsed |