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US1440729A
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Electric step-by-step motor of the unwound-armature type
Assignee: Thales Optronics Ltd
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Filing: 1921-03-30
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Granted: 1923-01-02
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Expires: 1941-03-30
Abstract
No abstract record available.
Inventors
- 👤 French James Weir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:17
CPC Classifications
H; H02; H02K; H02K37/00; H02K37/02; H02K37/06; H02K37/04
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) | 1926-01-01 | 1926-07-03 | 1927-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1930-01-01 | 1930-07-03 | 1931-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1934-01-01 | 1934-07-03 | 1935-01-02 | $7700.00 | Window Closed / Lapsed |