Patent US3566460A successfully refreshed from Google Patents.
US3566460A
Expired / Lapsed
US
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Method of producing commutator for rotary armatures
Assignee: Denso Corp
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Filing: 1969-02-05
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Granted: 1971-03-02
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Expires: 1989-02-05
Abstract
Abstract A METHOD OF PRODUCING A COMMUTATOR FOR ROTARY ARMATURES, WHICH COMPRISES BULGING THE WALL OF A FLANGED END PORTION OF A FLANGED TUBE OF ELECTRICALLY CONDUCTIVE MATERIAL RADIALLY OUTWARDLY TO FORM LONGITUDINALLY EXTENDING RECESSES AT PORTIONS WHERE WINDOWS ARE TO BE FORMED, FORMING ENGAGING HOOKS ON THE INSIDE WALL SURFACE OF SAID TUBE FOR EACH OF THE TUBE SECTIONS WHICH WILL PROVIDE INDEPENDENT COMMUTATOR SEGMENTS, MOLDING THE SAID TUBE WITH AN INSULATING MATERIAL AND THEREAFTER PUNCHING THE FLANGE OF THE TUBE IN SUCH A MANNER AS TO FORM WIRE-HOOKING LUGS AND TO REMOVE THE OUTWARDLY BULGED PORTIONS OF THE TUBE DEFINING SAID RECESSES.
Inventors
- 👤 Terumoto Yamaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:22
CPC Classifications
H; H01; H01R; H01R43/00; H01R43/06; H01R43/08; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009; Y10T29/49011
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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |