US2889487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Traveling-wave tube
Assignee: Raytheon Co
•
Filing: 1954-09-15
•
Granted: 1959-06-02
•
Expires: 1974-09-15
Abstract
No abstract record available.
Inventors
- 👤 Charles K Birdsall
- 👤 Sensiper Samuel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:46
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/02; H01J23/08; H01J23/083
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2064469A
Cited
US2679019A
Cited
US2707759A
Cited
US2725499A
Cited
GB709842A
Cited
US2773213A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-06-01 | 1962-12-01 | 1963-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-01 | 1966-12-01 | 1967-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-01 | 1970-12-01 | 1971-06-02 | $7700.00 | Window Closed / Lapsed |