US1887237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signaling system
Assignee: RCA Corp
•
Filing: 1929-05-31
•
Granted: 1932-11-08
•
Expires: 1949-05-31
Abstract
No abstract record available.
Inventors
- 👤 James L Finch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:39
CPC Classifications
H; H04; H04B; H04B14/00; H04B14/02; H04B14/026; H03; H03K; H03K7/00; H03K7/08; H04J; H04J3/00; H04J3/02; H04J3/04; H04J3/042; H04L; H04L5/00; H04L5/22; H04L5/24; H04L5/245
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) | 1935-11-08 | 1936-05-09 | 1936-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-11-08 | 1940-05-09 | 1940-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-11-08 | 1944-05-09 | 1944-11-08 | $7700.00 | Window Closed / Lapsed |