US2605432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Indirectly heated cathode structure
Assignee: Electrons Inc
•
Filing: 1949-10-19
•
Granted: 1952-07-29
•
Expires: 1969-10-19
Abstract
No abstract record available.
Inventors
- 👤 Earle K Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:37
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1925701A
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US1895361A
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US2097297A
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US2065997A
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US2112718A
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US2246176A
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US2297721A
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US2307979A
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US2497911A
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US2459997A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-07-29 | 1956-01-28 | 1956-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-29 | 1960-01-28 | 1960-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-29 | 1964-01-28 | 1964-07-29 | $7700.00 | Window Closed / Lapsed |