Patent US2187782A successfully refreshed from Google Patents.
US2187782A
Expired / Lapsed
US
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Thermionic tube modulator
Assignee: EMI Ltd
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Filing: 1936-10-10
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Granted: 1940-01-23
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Expires: 1956-10-10
Abstract
No abstract record available.
Inventors
- 👤 Hardwick John
- 👤 White Eric Lawrence Casling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:27
CPC Classifications
H; H03; H03C; H03C1/00; H03C1/16; H03C1/18; H03C1/22; H03C1/02; H03C1/06
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) | 1943-01-22 | 1943-07-24 | 1944-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-01-22 | 1947-07-24 | 1948-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-01-22 | 1951-07-24 | 1952-01-23 | $7700.00 | Window Closed / Lapsed |