Patent US4560893A successfully refreshed from Google Patents.
US4560893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric motor
Assignee: US Philips Corp
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Filing: 1984-04-13
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Granted: 1985-12-24
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Expires: 2004-04-13
Abstract
Abstract In an electric motor, for example as used in audio or video apparatus, the rotor comprises a disk-shaped carrier of synthetic resin in which coils are accommodated. In order to stimulate a uniform running of the motor the mass of the rotor is increased by manufacturing the carrier from a synthetic resin filled with a filler having a high specific mass.
Inventors
- 👤 Jan M. van de Griend
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:00
CPC Classifications
H; H02; H02K; H02K7/00; H02K7/02; H02K23/00; H02K23/54; H02K3/00; Y; Y02; Y02E; Y02E60/00; Y02E60/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
An electric motor comprising a rotor which has a disk-shaped carrier manufactured of a synthetic resin, said carrier comprising coils, means for increasing rotational inertia of said carrier, said means including lead oxide embedded in said synthetic resin, said synthetic resin and lead oxide being injection molded surrounding said coils.
Claim 2
Dependent Claim
50 words
An electric motor comprising a rotor which has a disk-shaped carrier manufactured of a synthetic resin, said carrier comprising coils, means for increasing rotational inertia of said carrier, said means including lead oxide embedded in said synthetic resin, said synthetic resin and lead oxide being injection molded surrounding said coils.
References Cited (Backward Citations)
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Cited
US3365351A
Cited
US3418505A
Cited
US3993920A
Cited
US4132910A
Cited
US4083735A
Cited
US4346773A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-12-23 | 1989-06-24 | 1989-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-23 | 1993-06-24 | 1993-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-23 | 1997-06-24 | 1997-12-24 | $7700.00 | Window Closed / Lapsed |