US2453659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Secret telegraph signaling
Assignee: E Gutzwiller & Co
•
Filing: 1942-12-21
•
Granted: 1948-11-09
•
Expires: 1962-12-21
Abstract
No abstract record available.
Inventors
- 👤 Henri Jean Joseph Marie De De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:23
CPC Classifications
H; H04; H04K; H04K1/00; H04K1/06; H04L; H04L9/00; H04L9/38
Claims Analysis
Total Claims: 0
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US2299388A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-11-09 | 1952-05-10 | 1952-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-09 | 1956-05-10 | 1956-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-09 | 1960-05-10 | 1960-11-09 | $7700.00 | Window Closed / Lapsed |