US2449224A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical circuit control
Assignee: AT&T Inc
•
Filing: 1944-07-15
•
Granted: 1948-09-14
•
Expires: 1964-07-15
Abstract
No abstract record available.
Inventors
- 👤 Jr Andrew S Hegeman
- 👤 Harry N Snook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:21
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/02; H02H3/021
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US518471A
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US656324A
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US1298464A
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US1204485A
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US1547693A
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US1594275A
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US1671023A
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US2108775A
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US2153291A
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US2170964A
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US2359175A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-09-14 | 1952-03-15 | 1952-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-09-14 | 1956-03-15 | 1956-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-09-14 | 1960-03-15 | 1960-09-14 | $7700.00 | Window Closed / Lapsed |