US2429243A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-frequency tube structure
Assignee: Sperry Gyroscope Co Inc
•
Filing: 1942-06-18
•
Granted: 1947-10-21
•
Expires: 1962-06-18
Abstract
No abstract record available.
Inventors
- 👤 Donald L Snow
- 👤 Edward L Ginzton
- 👤 Donald R Hamilton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:20
CPC Classifications
H; H01; H01J; H01J25/00; H01J25/02; H01J25/22; H01J25/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-10-20 | 1951-04-21 | 1951-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-10-20 | 1955-04-21 | 1955-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-10-20 | 1959-04-21 | 1959-10-21 | $7700.00 | Window Closed / Lapsed |