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Patent US3581389A successfully refreshed from Google Patents.
US3581389A
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Febrication of magnetic cores for electric rotating machines having axially-spaced air gaps
Assignee: Yaskawa Electric Corp
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Filing: 1968-09-18
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Granted: 1971-06-01
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Expires: 1988-09-18
Abstract
Abstract THE SIDE SLOTS OF A WOUND TYPE MAGNETIC CORE FOR AN ELECTRIC ROTATING MACHINE HAVING AN AXIALLY SPACED GAP ARE MADE RADIALLY RECTILINEAR BY FIRST PUNCHING, IN THE STRIP TO A NUMBER LESS THAN, EQUAL TO, OR GREATER THAN THE NUMBER CORRESPONDING TO THE REQUIRED NUMBER OF SLOTS, AND AFTER COMPLETION OF THE CORE WINDING, THE WINDING TURNS OF THE CORE ARE DECREASED OR INCREASED TO OBTAIN THE REQUIRED NUMBER OF SLOTS.
Inventors
- 👤 Tetsuro Mori
- 👤 Kazuo Karino
- 👤 Nobuo Matsui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:21
CPC Classifications
H; H02; H02K; H02K15/00; H02K15/02; H02K15/021; H02K15/026; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009; Y10T29/49012; Y10T29/4902; Y10T29/49071; Y10T29/49075; Y10T29/49078
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |