Patent US2984704A successfully refreshed from Google Patents.
US2984704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic determination of toll call charges
Assignee: AT&T Inc
•
Filing: 1956-12-07
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Granted: 1961-05-16
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Expires: 1976-12-07
Abstract
No abstract record available.
Inventors
- 👤 Noah S Terry
- 👤 Vroom Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:42
CPC Classifications
H; H04; H04M; H04M15/00; H04M15/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1650410A
Cited
US2222905A
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US2373908A
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US2767246A
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US2688440A
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US2783942A
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US2697133A
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US2781168A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-15 | 1964-11-14 | 1965-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-15 | 1968-11-14 | 1969-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-15 | 1972-11-14 | 1973-05-16 | $7700.00 | Window Closed / Lapsed |