US2921188A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single sideband diversity system
Assignee: Collins Radio Co
•
Filing: 1956-10-17
•
Granted: 1960-01-12
•
Expires: 1976-10-17
Abstract
No abstract record available.
Inventors
- 👤 Richard M Ringoen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:29
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/02; H04B7/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1747221A
Cited
US2293565A
Cited
US2510889A
Cited
US2555557A
Cited
GB663664A
Cited
US2698904A
Cited
US2835799A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |