US2662939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High selectivity amplifier
Assignee: Individual
•
Filing: 1949-04-02
•
Granted: 1953-12-15
•
Expires: 1969-04-02
Abstract
No abstract record available.
Inventors
- 👤 Nowak Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:31
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/06; H04B1/16; H04B1/163
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2115858A
Cited
US2162470A
Cited
DE691562C
Cited
US2248763A
Cited
US2173427A
Cited
US2268672A
Cited
US2197239A
Cited
US2315043A
Cited
CH245848A
Cited
US2359504A
Cited
US2439245A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-14 | 1957-06-15 | 1957-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-14 | 1961-06-15 | 1961-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-14 | 1965-06-15 | 1965-12-15 | $7700.00 | Window Closed / Lapsed |