US2430447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printing telegraph automatic switching system
Assignee: AT&T Inc
•
Filing: 1942-06-27
•
Granted: 1947-11-11
•
Expires: 1962-06-27
Abstract
No abstract record available.
Inventors
- 👤 David E Branson
- 👤 Rita S Kinkead
- 👤 Joseph A Krecek
- 👤 George A Locke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:02
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/54
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2380894A
Cited
US1870352A
Cited
US1895097A
Cited
US2193967A
Cited
US2131434A
Cited
US2116549A
Cited
US2193810A
Cited
US2172920A
Cited
US2341568A
Cited
US2279295A
Cited
US2304775A
Cited
US2331914A
Cited
US2347831A
Cited
US2340576A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-11-10 | 1951-05-12 | 1951-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-11-10 | 1955-05-12 | 1955-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-11-10 | 1959-05-12 | 1959-11-11 | $7700.00 | Window Closed / Lapsed |