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US2216998A
Expired / Lapsed
US
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Band-pass selector system
Assignee: BAE Systems Aerospace Inc
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Filing: 1938-04-27
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Granted: 1940-10-08
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Expires: 1958-04-27
Abstract
No abstract record available.
Inventors
- 👤 John F Farrington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:08
CPC Classifications
H; H03; H03G; H03G5/00; H03G5/16; H03G5/24; H03G5/26; H03F; H03F1/00; H03F1/34; H03F1/36; H03H; H03H7/00; H03H7/01; H03H7/0153; H03H7/0161; H03H7/0169
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) | 1943-10-08 | 1944-04-08 | 1944-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-10-08 | 1948-04-08 | 1948-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-10-08 | 1952-04-08 | 1952-10-08 | $7700.00 | Window Closed / Lapsed |