US2590989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit breaker
Assignee: DTE Energy Co
•
Filing: 1948-04-22
•
Granted: 1952-04-01
•
Expires: 1968-04-22
Abstract
No abstract record available.
Inventors
- 👤 Matthews George Augustus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:23
CPC Classifications
H; H01; H01H; H01H33/00; H01H33/02; H01H33/46; H01H73/00; H01H73/02; H01H73/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1441193A
Cited
US1883766A
Cited
US2112033A
Cited
US2140378A
Cited
US2231576A
Cited
US2192045A
Cited
US2365509A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-01 | 1955-10-01 | 1956-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-01 | 1959-10-01 | 1960-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-01 | 1963-10-01 | 1964-04-01 | $7700.00 | Window Closed / Lapsed |