US2405552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulse generating thermionic valve apparatus
Assignee: EMI Ltd
•
Filing: 1942-06-13
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Granted: 1946-08-13
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Expires: 1962-06-13
Abstract
No abstract record available.
Inventors
- 👤 Blumlein Alan Dower
- 👤 White Eric Lawrence Casling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:01
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/01; H03K3/00; H03K3/80
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) | 1949-08-12 | 1950-02-11 | 1950-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-08-12 | 1954-02-11 | 1954-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-08-12 | 1958-02-11 | 1958-08-13 | $7700.00 | Window Closed / Lapsed |