Patent US2351508A successfully refreshed from Google Patents.
US2351508A
Expired / Lapsed
US
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Electric motor control system
Assignee: Singer Co
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Filing: 1943-05-08
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Granted: 1944-06-13
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Expires: 1963-05-08
Abstract
No abstract record available.
Inventors
- 👤 Hugh G Hamilton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:48
CPC Classifications
H; H02; H02P; H02P29/00; H02P29/0016; H02P29/0022; Y; Y10; Y10S; Y10S388/00; Y10S388/90; Y10S388/905; Y10S388/923; Y10S388/93; Y10S388/932
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1947-06-13 | 1947-12-13 | 1948-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1951-06-13 | 1951-12-13 | 1952-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1955-06-13 | 1955-12-13 | 1956-06-13 | $7700.00 | Window Closed / Lapsed |