US2967259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resistance-strapped helix for a traveling wave tube
Assignee: Individual
•
Filing: 1959-07-23
•
Granted: 1961-01-03
•
Expires: 1979-07-23
Abstract
No abstract record available.
Inventors
- 👤 Richard P Lagerstrom
- 👤 Daniel G Dow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:58
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/16; H01J23/24; H01J23/26; H01J23/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2742588A
Cited
US2768322A
Cited
US2809321A
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US2889487A
Cited
US2840752A
Cited
US2806975A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-01-03 | 1964-07-04 | 1965-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-03 | 1968-07-04 | 1969-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-03 | 1972-07-04 | 1973-01-03 | $7700.00 | Window Closed / Lapsed |