Patent DE342194C successfully refreshed from Google Patents.
Patent US3323116A successfully refreshed from Google Patents.
Patent US3033757A successfully refreshed from Google Patents.
Patent US3611089A successfully refreshed from Google Patents.
Patent US2441504A successfully refreshed from Google Patents.
US2441504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio transmitting system
Assignee: SPX Technologies Inc
•
Filing: 1945-08-25
•
Granted: 1948-05-11
•
Expires: 1965-08-25
Abstract
No abstract record available.
Inventors
- 👤 John C O'brien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:35
CPC Classifications
H; H03; H03C; H03C3/00; H03C3/10; H03C3/12; H03C3/14
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-05-11 | 1951-11-10 | 1952-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-05-11 | 1955-11-10 | 1956-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-05-11 | 1959-11-10 | 1960-05-11 | $7700.00 | Window Closed / Lapsed |