US3305713A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct current brushless motor including pulse width modulation
Assignee: Hitachi Ltd
•
Filing: 1964-01-02
•
Granted: 1967-02-21
•
Expires: 1984-01-02
Abstract
No abstract record available.
Inventors
- 👤 Ikegami Kazutoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:24
CPC Classifications
H; H02; H02P; H02P6/00; H02P6/08; H02K; H02K29/00; H02K29/06; H02K29/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2809339A
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US2785236A
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US3079539A
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FR1308238A
Cited
US3204165A
Cited
US3154730A
Cited
US3131340A
Cited
US3214663A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |