US2218309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermionic valve apparatus for use on very short wave lengths
Assignee: RCA Corp
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Filing: 1935-02-27
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Granted: 1940-10-15
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Expires: 1955-02-27
Abstract
No abstract record available.
Inventors
- 👤 Davis Norman Eustace
- 👤 Green Ernest
- 👤 Hall Alfred Weedon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:31
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/02; H04B1/03; H04B1/036
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1943-10-15 | 1944-04-15 | 1944-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-10-15 | 1948-04-15 | 1948-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-10-15 | 1952-04-15 | 1952-10-15 | $7700.00 | Window Closed / Lapsed |