Patent US2724741A successfully refreshed from Google Patents.
US2724741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Local and remote exchange timed metering
Assignee: Automatic Electric Laboratories Inc
•
Filing: 1950-06-21
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Granted: 1955-11-22
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Expires: 1970-06-21
Abstract
No abstract record available.
Inventors
- 👤 Clarence E Lomax
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:10
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/0016; H04M; H04M15/00; H04M15/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2282975A
Cited
US1119915A
Cited
US1532241A
Cited
US1944704A
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US2188461A
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US2073756A
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US2094060A
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US2232181A
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US2225386A
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US2250735A
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US2566330A
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US2543022A
Cited
US2567209A
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US2546605A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-11-21 | 1959-05-23 | 1959-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-21 | 1963-05-23 | 1963-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-21 | 1967-05-23 | 1967-11-22 | $7700.00 | Window Closed / Lapsed |