US2991450A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reading recorded data
Assignee: AT&T Inc
•
Filing: 1955-05-13
•
Granted: 1961-07-04
•
Expires: 1975-05-13
Abstract
No abstract record available.
Inventors
- 👤 Erlon W Flint
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:56
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1399997A
Cited
US2077965A
Cited
US2207743A
Cited
US2484649A
Cited
US2636672A
Cited
US2690222A
Cited
US2757864A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-03 | 1965-01-02 | 1965-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-03 | 1969-01-02 | 1969-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-03 | 1973-01-02 | 1973-07-04 | $7700.00 | Window Closed / Lapsed |