Patent US2472760A successfully refreshed from Google Patents.
US2472760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrode for electron discharge devices
Assignee: GTE Sylvania Inc
•
Filing: 1943-12-30
•
Granted: 1949-06-07
•
Expires: 1963-12-30
Abstract
No abstract record available.
Inventors
- 👤 Harry L Ratchford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:53
CPC Classifications
H; H01; H01J; H01J19/00; H01J19/28; H01J19/38; H01J2893/00; H01J2893/0001; H01J2893/0012; H01J2893/0015; H01J2893/0019; H01J2893/0022
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1655269A
Cited
US803684A
Cited
US1719774A
Cited
US1566534A
Cited
US1096655A
Cited
US1346192A
Cited
US1236383A
Cited
US1342801A
Cited
US1407525A
Cited
GB407658A
Cited
US2032694A
Cited
US2183635A
Cited
US2395313A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-06-06 | 1952-12-06 | 1953-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-06 | 1956-12-06 | 1957-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-06 | 1960-12-06 | 1961-06-07 | $7700.00 | Window Closed / Lapsed |