US2220840A
Expired / Lapsed
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Velocity modulation device
Assignee: General Electric Co
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Filing: 1938-04-14
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Granted: 1940-11-05
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Expires: 1958-04-14
Abstract
No abstract record available.
Inventors
- 👤 George F Metcalf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:01
CPC Classifications
F; F16; F16F; F16F9/00; F16F9/10; F16F9/14; F16F9/16; F16F9/18; F16F9/19; H; H01; H01J; H01J23/00; H01J23/36; H01J23/40; H01J23/48; H01J25/00; H01J25/02; H01J25/06; H01J25/10; H01J25/12; H01J25/22; H01J25/24; H01J29/00; H01J29/86; H01J29/88; H01J5/00; H01J5/02; H01J5/08; H01P; H01P5/00; H01P5/04; H03; H03C; H03C3/00; H03C3/30; H03L; H03L5/00; H04; H04L; H04L27/00; H04L27/02; H04L27/04
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) | 1943-11-05 | 1944-05-06 | 1944-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-11-05 | 1948-05-06 | 1948-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-11-05 | 1952-05-06 | 1952-11-05 | $7700.00 | Window Closed / Lapsed |