US2820171A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Travelling wave tube
Assignee: Telefunken AG
•
Filing: 1954-02-08
•
Granted: 1958-01-14
•
Expires: 1974-02-08
Abstract
No abstract record available.
Inventors
- 👤 Lauer Anton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:47
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/16; H01J23/24; H01J23/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2197123A
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US2636948A
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US2575383A
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US2632130A
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US2720609A
Cited
US2626371A
Cited
US2750529A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-13 | 1961-07-15 | 1962-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-13 | 1965-07-15 | 1966-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-13 | 1969-07-15 | 1970-01-14 | $7700.00 | Window Closed / Lapsed |