US2951908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone system for repertory dialing
Assignee: AT&T Inc
•
Filing: 1957-08-05
•
Granted: 1960-09-06
•
Expires: 1977-08-05
Abstract
No abstract record available.
Inventors
- 👤 William A Malthaner
- 👤 Henry E Vaughan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:27
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/42; H04M3/424; H04M1/00; H04M1/26; H04M1/27; H04M1/274; H04M1/276
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1738624A
Cited
US2564441A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-06 | 1964-03-07 | 1964-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-06 | 1968-03-07 | 1968-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-06 | 1972-03-07 | 1972-09-06 | $7700.00 | Window Closed / Lapsed |