Patent US2761900A successfully refreshed from Google Patents.
US2761900A
Expired / Lapsed
US
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Telephone system of the coin controlled type
Assignee: AT&T Inc
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Filing: 1952-07-17
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Granted: 1956-09-04
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Expires: 1972-07-17
Abstract
No abstract record available.
Inventors
- 👤 Jr Amos E Joel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:29
CPC Classifications
H; H04; H04M; H04M17/00; H04M17/02; H04M17/023
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2000804A
Cited
US1917884A
Cited
US2082561A
Cited
US2357576A
Cited
US2385061A
Cited
GB604547A
Cited
US2602119A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-04 | 1960-03-05 | 1960-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-04 | 1964-03-05 | 1964-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-04 | 1968-03-05 | 1968-09-04 | $7700.00 | Window Closed / Lapsed |