US1864074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telegraph signaling system
Assignee: AT&T Teletype Corp
•
Filing: 1928-04-02
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Granted: 1932-06-21
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Expires: 1948-04-02
Abstract
No abstract record available.
Inventors
- 👤 Howard L Krum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:20
CPC Classifications
H; H04; H04L; H04L13/00; H04L13/02; H04L13/08
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) | 1935-06-21 | 1935-12-21 | 1936-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-06-21 | 1939-12-21 | 1940-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-06-21 | 1943-12-21 | 1944-06-21 | $7700.00 | Window Closed / Lapsed |