US2474407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polarity indicator plug
Assignee: KELLEY KOETT Manufacturing CO
•
Filing: 1945-01-15
•
Granted: 1949-06-28
•
Expires: 1965-01-15
Abstract
No abstract record available.
Inventors
- 👤 William L Todd
- 👤 Elbert E Greenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:34
CPC Classifications
G; G01; G01R; G01R19/00; G01R19/14; H; H01; H01R; H01R13/00; H01R13/66; H01R13/717
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1971899A
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US2034273A
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US1835882A
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US2023916A
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US2213973A
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US2316163A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-06-27 | 1952-12-27 | 1953-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-27 | 1956-12-27 | 1957-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-27 | 1960-12-27 | 1961-06-28 | $7700.00 | Window Closed / Lapsed |