US2941043A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic drum repertory dialer
Assignee: AT&T Inc
•
Filing: 1957-08-13
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Granted: 1960-06-14
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Expires: 1977-08-13
Abstract
No abstract record available.
Inventors
- 👤 Jr James H Ham
- 👤 Harold J Hershey
- 👤 Jr Lawrence A Hohmann
- 👤 Frank W Kinsman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:32
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)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-14 | 1963-12-14 | 1964-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-14 | 1967-12-14 | 1968-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-14 | 1971-12-14 | 1972-06-14 | $7700.00 | Window Closed / Lapsed |