Patent US3568309A successfully refreshed from Google Patents.
US3568309A
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Method of manufacturing dynamo electric machines
Assignee: ZF International UK Ltd
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Filing: 1969-02-25
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Granted: 1971-03-09
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Expires: 1989-02-25
Abstract
Abstract A DYNAMO ELECTRIC MACHINE INCLUDING A ROTOR AND A COMMUTATOR ROTATABLE WITH THE ROTOR, THE ENDS OF THE WINDINGS OF THE ROTOR BEING CONNECTED TO THE CONDUCTIVE SEGMENTS OF THE COMMUTATOR, AND CONSTITUTING PART OF EACH OF THE FACES OF THE CONDUCTIVE SEGMENTS OF THE COMMUTATOR ON WHICH THE BRUSHES OF THE MACHINE RUN IN USE.
Inventors
- 👤 Kenneth Preece
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:27
CPC Classifications
H; H01; H01R; H01R43/00; H01R43/06; H01R43/08; H01R39/00; H01R39/02; H01R39/04; H01R39/06; 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) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |