US2417609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic commutator
Assignee: Shell Development Co
•
Filing: 1943-07-28
•
Granted: 1947-03-18
•
Expires: 1963-07-28
Abstract
No abstract record available.
Inventors
- 👤 Jr David Saville Muzzey
- 👤 Miller Robert Du Wayne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:50
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/53; H03K3/55; G; G01; G01V; G01V3/00; G01V3/02; G01V3/06; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/51
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1723888A
Cited
US1834889A
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US2334491A
Cited
US2166310A
Cited
US2294395A
Cited
US2276974A
Cited
US2314873A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-03-17 | 1950-09-16 | 1951-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-03-17 | 1954-09-16 | 1955-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-03-17 | 1958-09-16 | 1959-03-18 | $7700.00 | Window Closed / Lapsed |