Patent US2754428A successfully refreshed from Google Patents.
US2754428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron discharge device
Assignee: Individual
•
Filing: 1951-09-17
•
Granted: 1956-07-10
•
Expires: 1971-09-17
Abstract
No abstract record available.
Inventors
- 👤 George W Franks
- 👤 John N Hamilton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:04
CPC Classifications
G; G21; G21H; G21H1/00; G21H1/12; H; H01; H01J; H01J40/00; H01J40/16; H01J40/18
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1173110A
Cited
US1145735A
Cited
US1775588A
Cited
US1788553A
Cited
US1965849A
Cited
US1917854A
Cited
US2039134A
Cited
US2092814A
Cited
US2206387A
Cited
GB499661A
Cited
US2218340A
Cited
US2258294A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-07-10 | 1960-01-09 | 1960-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-10 | 1964-01-09 | 1964-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-10 | 1968-01-09 | 1968-07-10 | $7700.00 | Window Closed / Lapsed |