US2615137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-power vacuum tube
Assignee: Individual
•
Filing: 1946-01-05
•
Granted: 1952-10-21
•
Expires: 1966-01-05
Abstract
No abstract record available.
Inventors
- 👤 Stephen M Duke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:19
CPC Classifications
H; H01; H01J; H01J19/00; H01J19/28; H01J19/32; H01J19/34; H01J2893/00; H01J2893/0001; H01J2893/0002; H01J2893/0003
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2169879A
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US1669145A
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US1957223A
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US2009444A
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US2012038A
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US2288380A
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US2298950A
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US2323364A
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US2492313A
Cited
US2380502A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-10-21 | 1956-04-21 | 1956-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-21 | 1960-04-21 | 1960-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-21 | 1964-04-21 | 1964-10-21 | $7700.00 | Window Closed / Lapsed |