Patent US4650457A successfully refreshed from Google Patents.
US2544944A
Expired / Lapsed
US
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Restricted service automatic telephone system
Assignee: Automatic Electric Laboratories Inc
•
Filing: 1947-06-03
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Granted: 1951-03-13
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Expires: 1967-06-03
Abstract
No abstract record available.
Inventors
- 👤 Wicks John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:28
CPC Classifications
H; H04; H04Q; H04Q3/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1256126A
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US1649494A
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US2039668A
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US2214213A
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US2217041A
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US2248575A
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US2286431A
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US2299514A
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US2366647A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-12 | 1954-09-11 | 1955-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-12 | 1958-09-11 | 1959-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-12 | 1962-09-11 | 1963-03-13 | $7700.00 | Window Closed / Lapsed |