Patent US5073738A successfully refreshed from Google Patents.
US5073738A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct current motor having a retaining device for holding magnets
Assignee: Individual
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Filing: 1990-12-27
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Granted: 1991-12-17
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Expires: 2010-12-27
Abstract
Abstract A direct current motor includes a housing which is cylindrically shaped. Four magnets are received within the housing and contact the inner surface of the housing. A pair of rings are force-fitted within the end portions of the housing and are coupled together by bolts. Each of the rings has an annular flange extended inward. The magnets are retained between the annular flanges of the rings so that the magnets can be stably retained in place by the rings without any adhesive material.
Inventors
- 👤 Yeong Y. Tang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:55
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/12; H02K1/17
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
A direct current motor comprising a housing which is cylindrically shaped, at least two magnets being received within said housing and contacting an inner surface of said housing, a pair of rings being force-fitted within end portions of said housing and being coupled together by bolts, each of said rings having an annular flange extended inward therefrom, said magnets being retained and coupled between said annular flanges of said rings, each of said annular flanges having at least two recesses formed in an inner surface thereof, each of said recesses having a shape similar to that of an end portion of each of said magnets so that said end portions of said magnets can be engaged within said recesses respectively and so that said magnets can be stably retained in place by said rings without any adhesive material.
Claim 2
Dependent Claim
138 words
A direct current motor comprising a housing which is cylindrically shaped, at least two magnets being received within said housing and contacting an inner surface of said housing, a pair of rings being force-fitted within end portions of said housing and being coupled together by bolts, each of said rings having an annular flange extended inward therefrom, said magnets being retained and coupled between said annular flanges of said rings, each of said annular flanges having at least two recesses formed in an inner surface thereof, each of said recesses having a shape similar to that of an end portion of each of said magnets so that said end portions of said magnets can be engaged within said recesses respectively and so that said magnets can be stably retained in place by said rings without any adhesive material.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-16 | 1995-06-17 | 1995-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-16 | 1999-06-17 | 1999-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-16 | 2003-06-17 | 2003-12-17 | $7700.00 | Window Closed / Lapsed |