US3497730A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary and linear polyphase motors having staggered field winding arrangements
Assignee: Doosan Bobcat North America Inc
•
Filing: 1968-01-19
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Granted: 1970-02-24
•
Expires: 1988-01-19
Abstract
No abstract record available.
Inventors
- 👤 Mac R Doolittle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:24
CPC Classifications
H; H02; H02K; H02K41/00; H02K41/02; H02K17/00; H02K17/02; H02K17/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2774922A
Cited
US3089069A
Cited
US3281655A
Cited
US3218489A
Cited
US3292065A
Cited
US3391289A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-23 | 1973-08-25 | 1974-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-23 | 1977-08-25 | 1978-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-23 | 1981-08-25 | 1982-02-24 | $7700.00 | Window Closed / Lapsed |