Patent US2602148A successfully refreshed from Google Patents.
US2602148A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-frequency amplifier
Assignee: AT&T Inc
•
Filing: 1946-10-22
•
Granted: 1952-07-01
•
Expires: 1966-10-22
Abstract
No abstract record available.
Inventors
- 👤 John R Pierce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:39
CPC Classifications
H; H01; H01J; H01J25/00; H01J25/34; H01J25/36; H01J25/38; B; B23; B23F; B23F5/00; B23F5/02; B23F5/06; D; D06; D06C; D06C5/00; D06C5/005; H01J23/00; H01J23/02; H01J23/08; H01J23/087; H01J23/36; H01J23/40; H01J23/42; H01J23/48; H01J23/52
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-07-01 | 1955-12-31 | 1956-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-01 | 1959-12-31 | 1960-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-01 | 1963-12-31 | 1964-07-01 | $7700.00 | Window Closed / Lapsed |