US2997618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bar-strapped multifilar helix for traveling-wave tube
Assignee: Individual
•
Filing: 1959-07-21
•
Granted: 1961-08-22
•
Expires: 1979-07-21
Abstract
No abstract record available.
Inventors
- 👤 Dean A Watkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:35
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/16; H01J23/24; H01J23/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2768322A
Cited
US2774005A
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US2802135A
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US2846613A
Cited
US2809321A
Cited
US2889487A
Cited
US2806975A
Cited
US2859375A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-21 | 1965-02-20 | 1965-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-21 | 1969-02-20 | 1969-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-21 | 1973-02-20 | 1973-08-22 | $7700.00 | Window Closed / Lapsed |