US2432092A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Relay testing device
Assignee: AT&T Inc
•
Filing: 1943-09-02
•
Granted: 1947-12-09
•
Expires: 1963-09-02
Abstract
No abstract record available.
Inventors
- 👤 Enoch B Ferrell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:02
CPC Classifications
H; H04; H04Q; H04Q1/00; H04Q1/18; H04Q1/20
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1526337A
Cited
US1487267A
Cited
US1560544A
Cited
US1944211A
Cited
US1941253A
Cited
US1971196A
Cited
US2210324A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-12-08 | 1951-06-09 | 1951-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-12-08 | 1955-06-09 | 1955-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-12-08 | 1959-06-09 | 1959-12-09 | $7700.00 | Window Closed / Lapsed |