Patent US2423829A successfully refreshed from Google Patents.
US2423829A
Expired / Lapsed
US
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Indicating system
Assignee: AT&T Inc
•
Filing: 1943-09-16
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Granted: 1947-07-15
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Expires: 1963-09-16
Abstract
No abstract record available.
Inventors
- 👤 Enoch B Ferrell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:57
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1978684A
Cited
US2098695A
Cited
US2229698A
Cited
US2279151A
Cited
US2172395A
Cited
US2189549A
Cited
US2283951A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-07-14 | 1951-01-13 | 1951-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-07-14 | 1955-01-13 | 1955-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-07-14 | 1959-01-13 | 1959-07-15 | $7700.00 | Window Closed / Lapsed |