US2744981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for controlling current flow in electric circuits
Assignee: Individual
•
Filing: 1953-06-16
•
Granted: 1956-05-08
•
Expires: 1973-06-16
Abstract
No abstract record available.
Inventors
- 👤 Morton F Spears
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:33
CPC Classifications
H; H01; H01H; H01H81/00; H01H81/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1888762A
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US1577981A
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US1663810A
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US1728045A
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US1913131A
Cited
US2119022A
Cited
US2587916A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-08 | 1959-11-07 | 1960-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-08 | 1963-11-07 | 1964-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-08 | 1967-11-07 | 1968-05-08 | $7700.00 | Window Closed / Lapsed |