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US2265996A
Expired / Lapsed
US
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Thermionic valve circuits
Assignee: EMI Ltd
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Filing: 1939-04-22
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Granted: 1941-12-16
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Expires: 1959-04-22
Abstract
No abstract record available.
Inventors
- 👤 Blumlein Alan Dower
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:59
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/01; H03K5/04; H03K5/06; H04; H04N; H04N5/00; H04N5/04; H04N5/06
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) | 1944-12-15 | 1945-06-16 | 1945-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-12-15 | 1949-06-16 | 1949-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-12-15 | 1953-06-16 | 1953-12-16 | $7700.00 | Window Closed / Lapsed |