US2704879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermionic valves
Assignee: Hivac Ltd
•
Filing: 1947-03-18
•
Granted: 1955-03-29
•
Expires: 1967-03-18
Abstract
No abstract record available.
Inventors
- 👤 Diggle Harry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:21
CPC Classifications
H; H01; H01J; H01J19/00; H01J2893/00; H01J2893/0001; H01J2893/0012; H01J2893/0019; H01J2893/0022; H01J2893/0025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1472505A
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US1934097A
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US2050416A
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US2166744A
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US2370538A
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US2380525A
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US2415360A
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US2610387A
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US2503806A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-03-28 | 1958-09-27 | 1959-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-03-28 | 1962-09-27 | 1963-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-03-28 | 1966-09-27 | 1967-03-29 | $7700.00 | Window Closed / Lapsed |