US2449221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetically controlled switch
Assignee: Trumbull Electric Manufacturing Co
•
Filing: 1942-10-24
•
Granted: 1948-09-14
•
Expires: 1962-10-24
Abstract
No abstract record available.
Inventors
- 👤 Herman J Hammerly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:21
CPC Classifications
H; H01; H01H; H01H50/00; H01H50/54; H01H50/541
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB147599A
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US1816429A
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US1938309A
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US2069169A
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US2069171A
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US1917909A
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US2013013A
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US2129723A
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US2208225A
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US2282066A
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US2296454A
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 |