US1869659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of maintaining secrecy in the transmission of wireless telegraphic messages
Assignee: Individual
•
Filing: 1929-11-14
•
Granted: 1932-08-02
•
Expires: 1949-11-14
Abstract
No abstract record available.
Inventors
- 👤 Broertjes Willem
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:32
CPC Classifications
H; H04; H04L; H04L9/00; H04L9/34; H04L2209/00; H04L2209/80
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) | 1935-08-02 | 1936-02-01 | 1936-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-08-02 | 1940-02-01 | 1940-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-08-02 | 1944-02-01 | 1944-08-02 | $7700.00 | Window Closed / Lapsed |