US2640112A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultrahigh-frequency electron tube
Assignee: International Standard Electric Corp
•
Filing: 1948-12-14
•
Granted: 1953-05-26
•
Expires: 1968-12-14
Abstract
No abstract record available.
Inventors
- 👤 Touraton Emile
- 👤 Zwobada Rene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:07
CPC Classifications
H; H01; H01J; H01J25/00; H01J25/02; H01J25/10; H01J25/12
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2280824A
Cited
US2281935A
Cited
US2406371A
Cited
US2460288A
Cited
US2368031A
Cited
US2405611A
Cited
US2464549A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-25 | 1956-11-24 | 1957-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-25 | 1960-11-24 | 1961-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-25 | 1964-11-24 | 1965-05-26 | $7700.00 | Window Closed / Lapsed |