US2953647A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic drum repertory dialer
Assignee: AT&T Inc
•
Filing: 1956-11-09
•
Granted: 1960-09-20
•
Expires: 1976-11-09
Abstract
No abstract record available.
Inventors
- 👤 Alfred E Johanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:10
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/26; H04M1/27; H04M1/274; H04M1/276
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2298519A
Cited
US2399229A
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US2502517A
Cited
US2567812A
Cited
US2522119A
Cited
US2611037A
Cited
US2558187A
Cited
US2723312A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-20 | 1964-03-21 | 1964-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-20 | 1968-03-21 | 1968-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-20 | 1972-03-21 | 1972-09-20 | $7700.00 | Window Closed / Lapsed |