Patent US2440040A successfully refreshed from Google Patents.
US2440040A
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Assignee: AT&T Inc
•
Filing: 1944-09-08
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Granted: 1948-04-20
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Expires: 1964-09-08
Abstract
No abstract record available.
Inventors
- 👤 Perry H Burton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:25
CPC Classifications
G; G09; G09F; G09F3/00; G09F3/04; G09F3/06; Y; Y10; Y10T; Y10T29/00; Y10T29/53; Y10T29/53709
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US232428A
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US263381A
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US397290A
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US1325997A
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US954297A
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US1045803A
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US1042404A
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US1355465A
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US1490847A
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US2333997A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-04-20 | 1951-10-20 | 1952-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-20 | 1955-10-20 | 1956-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-20 | 1959-10-20 | 1960-04-20 | $7700.00 | Window Closed / Lapsed |