US2574458A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Remote monitoring system
Assignee: Sprague Electric Co
•
Filing: 1947-06-27
•
Granted: 1951-11-13
•
Expires: 1967-06-27
Abstract
No abstract record available.
Inventors
- 👤 John F Atkinson
- 👤 Lubin Samuel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:21
CPC Classifications
H; H02; H02J; H02J13/00; H02J13/13; H02J13/1311; Y; Y02; Y02E; Y02E60/00; Y04; Y04S; Y04S40/00; Y04S40/12; Y04S40/121
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1639000A
Cited
GB261384A
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US2039405A
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US2039404A
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US2198901A
Cited
US2295442A
Cited
US2286428A
Cited
US2398046A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-12 | 1955-05-14 | 1955-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-12 | 1959-05-14 | 1959-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-12 | 1963-05-14 | 1963-11-13 | $7700.00 | Window Closed / Lapsed |