US2474978A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit arrangement for use with widely separated frequency bands
Assignee: International Standard Electric Corp
•
Filing: 1945-08-18
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Granted: 1949-07-05
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Expires: 1965-08-18
Abstract
No abstract record available.
Inventors
- 👤 Holland John Douglas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:31
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/08; H03B5/10; H03D; H03D7/00; H03D7/06; H03F; H03F1/00; H03F1/42; H03F1/48; H03F1/50; H03F3/00; H03F3/46; H03F3/48; H03F3/66; H04; H04B; H04B1/00; H04B1/06; H04B1/16; H04B1/26; H04J; H04J1/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2006969A
Cited
US2058512A
Cited
US2201365A
Cited
US2189317A
Cited
US2257782A
Cited
US2288486A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-07-04 | 1953-01-03 | 1953-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-07-04 | 1957-01-03 | 1957-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-07-04 | 1961-01-03 | 1961-07-05 | $7700.00 | Window Closed / Lapsed |