US2515280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-frequency tube structure with frequency control
Assignee: Unisys Corp
•
Filing: 1945-03-02
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Granted: 1950-07-18
•
Expires: 1965-03-02
Abstract
No abstract record available.
Inventors
- 👤 Sigurd F Varian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:58
CPC Classifications
H; H01; H01J; H01J25/00; H01J25/02; H01J25/22; H01J25/24; H01J25/10; H01J25/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1658953A
Cited
US2079809A
Cited
US2374810A
Cited
US2311658A
Cited
US2414785A
Cited
US2408817A
Cited
US2438132A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-07-17 | 1954-01-16 | 1954-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-17 | 1958-01-16 | 1958-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-17 | 1962-01-16 | 1962-07-18 | $7700.00 | Window Closed / Lapsed |