US1642173A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio signaling system
Assignee: RCA Corp
•
Filing: 1922-03-02
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Granted: 1927-09-13
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Expires: 1942-03-02
Abstract
No abstract record available.
Inventors
- 👤 Joseph-Round Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:58
CPC Classifications
H; H03; H03J; H03J7/00; H03J7/02; H03J7/04; H03J7/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1930-09-12 | 1931-03-14 | 1931-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1934-09-12 | 1935-03-14 | 1935-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1938-09-12 | 1939-03-14 | 1939-09-13 | $7700.00 | Window Closed / Lapsed |