Patent US2528446A successfully refreshed from Google Patents.
US2528446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Current control circuit
Assignee: AT&T Inc
•
Filing: 1947-07-07
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Granted: 1950-10-31
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Expires: 1967-07-07
Abstract
No abstract record available.
Inventors
- 👤 John H Mcconnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:54
CPC Classifications
B; B23; B23Q; B23Q3/00; B23Q3/15
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2025775A
Cited
US2118174A
Cited
GB461203A
Cited
US2244058A
Cited
US2240749A
Cited
US2347369A
Cited
US2414899A
Cited
US2445459A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-10-30 | 1954-05-01 | 1954-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-30 | 1958-05-01 | 1958-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-30 | 1962-05-01 | 1962-10-31 | $7700.00 | Window Closed / Lapsed |