Patent US3964112A successfully refreshed from Google Patents.
Patent US1743478A successfully refreshed from Google Patents.
US1743478A
Expired / Lapsed
US
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Magnetic device
Assignee: AT&T Inc
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Filing: 1927-10-21
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Granted: 1930-01-14
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Expires: 1947-10-21
Abstract
No abstract record available.
Inventors
- 👤 Edward J Pratt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:18
CPC Classifications
G; G06; G06M; G06M1/00; G06M1/04; H; H04; H04M; H04M15/00; H04M15/10; Y; Y10; Y10T; Y10T74/00; Y10T74/15; Y10T74/1526; Y10T74/1553; Y10T74/1555; Y10T74/1556
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1933-01-13 | 1933-07-15 | 1934-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1937-01-13 | 1937-07-15 | 1938-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1941-01-13 | 1941-07-15 | 1942-01-14 | $7700.00 | Window Closed / Lapsed |