Patent US2561421A successfully refreshed from Google Patents.
US2561421A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Receiver-transmitter arrangement
Assignee: Individual
•
Filing: 1945-04-02
•
Granted: 1951-07-24
•
Expires: 1965-04-02
Abstract
No abstract record available.
Inventors
- 👤 Seale Ray
- 👤 Edward J Pekol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:12
CPC Classifications
B; B63; B63C; B63C9/00; B63C9/21; H; H04; H04B; H04B1/00; H04B1/38; H04B1/3827
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
GB371476A
Cited
GB521139A
Cited
US2160663A
Cited
US2252083A
Cited
US2416794A
Cited
US2415667A
Cited
US2425315A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-23 | 1955-01-22 | 1955-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-23 | 1959-01-22 | 1959-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-23 | 1963-01-22 | 1963-07-24 | $7700.00 | Window Closed / Lapsed |