Patent US5490319A successfully refreshed from Google Patents.
US5490319A
Expired / Lapsed
US
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Thermotropic liquid crystal polymer composition and insulator
Assignee: Ebara Corp
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Filing: 1994-08-03
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Granted: 1996-02-13
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Expires: 2014-08-03
Abstract
Abstract The improved thermotropic LCP composition comprises 10-13 wt. % of a thermotropic liquid crystal polymer resin and 90-87 wt. % of zircon and is useful as an electrical insulator. The composition is a good electrical insulator, permits good heat conduction and experiences small thermal expansion, thus insuring high reliability. The composition may be injection molded to form an electrically insulated housing of a stator for electric machines or appliances that includes a coil and terminals thereof.
Inventors
- 👤 Toshio Nakamura
- 👤 Yoshimi Soeda
- 👤 Toshifumi Miyasaka
- 👤 Minoru Iwata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:44
CPC Classifications
H; H02; H02K; H02K5/00; H02K5/04; H02K5/08; C; C08; C08K; C08K3/00; C08K3/34; C09; C09K; C09K19/00; C09K19/04; C09K19/38; C09K19/3804; C09K19/3809; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
168 words
A method for preparing a resin molded stator of a submersible motor comprising the steps of: mixing about 10-13 percent by weight of a thermoplastic liquid crystalline polymer resin with about 90-87 percent by weight of zircon comprising particles of about 1-60 μm in size while heating at a temperature of about 260°-330° C. to form pellets comprising a homogenous thermotropic polymer composition; and performing injection molding with the pellets at a temperature of about 260°-330° C. through two stages, the first stage in which the slots in the stator core and the space around the coil end portions at opposite ends of the core are filled with a resin composition at a pressure of 600-1400 kgf/cm 2 and the second stage in which a can, a frame and frame side plates are mounted on the thus produced stator core to form a submersible motor and the resulting space around the coil end portions is filled with a resin composition at a pressure of 400-700 kgf/cm 2 .
Claim 2
Independent Claim
168 words
A method for preparing a resin molded stator of a submersible motor comprising the steps of: mixing about 10-13 percent by weight of a thermoplastic liquid crystalline polymer resin with about 90-87 percent by weight of zircon comprising particles of about 1-60 μm in size while heating at a temperature of about 260°-330° C. to form pellets comprising a homogenous thermotropic polymer composition; and performing injection molding with the pellets at a temperature of about 260°-330° C. through two stages, the first stage in which the slots in the stator core and the space around the coil end portions at opposite ends of the core are filled with a resin composition at a pressure of 600-1400 kgf/cm 2 and the second stage in which a can, a frame and frame side plates are mounted on the thus produced stator core to form a submersible motor and the resulting space around the coil end portions is filled with a resin composition at a pressure of 400-700 kgf/cm 2 .
Claim 3
Dependent Claim
17 words
The method as claimed in claim 1, wherein said thermoplastic liquid crystalline polymer is an aromatic polyester.
Claim 4
Dependent Claim
23 words
The method as claimed in claim 1, wherein said thermoplastic liquid crystalline polymer resin is a copolymer of parahydroxybenzoic acid and polyethylene terephthalate.
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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) | 1999-02-12 | 1999-08-14 | 2000-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-02-12 | 2003-08-14 | 2004-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-02-12 | 2007-08-14 | 2008-02-13 | $7700.00 | Window Closed / Lapsed |