Patent US4288021A successfully refreshed from Google Patents.
Patent US5139820A successfully refreshed from Google Patents.
US5139820A
Expired / Lapsed
US
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Method of manufacturing ceramic insulated wire
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1990-12-21
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Granted: 1992-08-18
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Expires: 2010-12-21
Abstract
Abstract A method of manufacturing a ceramic insulated wire involves preparing an extrudable gel compound formed by dissolving a metal-organic compound in a solvent and adding at least one thermoplastic polymer or its monomer to the mixture to make the gel compound extrudable. The so prepared extrudable gel compound is then extruded around the outer periphery of a conductor for coating the conductor with a gel coating. Thereafter a heat treatment is performed for sintering the gel compound to form a ceramic coating.
Inventors
- 👤 Kazuo Sawada
- 👤 Shinji Inazawa
- 👤 Kouichi Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:58
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/02; H01B13/00; H01B13/06; H01B13/14; H01B13/145; H01B3/08; H01B3/081; H01B3/10; H01B3/105
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
109 words
A method of manufacturing a ceramic insulated wire, comprising the steps of: (a) preparing a gel compound formed by dissolving an organic compound of a metal in a solvent; (b) increasing the viscosity of said gel compound to make said gel compound extrudable by adding to said gel compound at least one member of the group consisting of thermoplastic polymers and thermoplastic monomers of said thermoplastic polymers; (c) extruding said gel compound around the outer periphery of a conductor for coating said conductor with a gel coating; and (d) heat treating said conductor and gel coating for sintering said gel compound to form a ceramic insulation on said conductor.
Claim 2
Independent Claim
109 words
A method of manufacturing a ceramic insulated wire, comprising the steps of: (a) preparing a gel compound formed by dissolving an organic compound of a metal in a solvent; (b) increasing the viscosity of said gel compound to make said gel compound extrudable by adding to said gel compound at least one member of the group consisting of thermoplastic polymers and thermoplastic monomers of said thermoplastic polymers; (c) extruding said gel compound around the outer periphery of a conductor for coating said conductor with a gel coating; and (d) heat treating said conductor and gel coating for sintering said gel compound to form a ceramic insulation on said conductor.
Claim 3
Dependent Claim
33 words
The method of claim 1, wherein said organic compound of a metal is an organic compound of at least one metal selected from the group consisting of Si, Al, Zr, Ti and Mg.
Claim 4
Dependent Claim
32 words
The method of claim 1, wherein one of methacrylic acid and diethylene triamine is employed as said monomer of said thermoplastic polymer, and wherein polyacrylic acid is employed as said thermoplastic polymer.
Claim 5
Dependent Claim
15 words
The method of claim 1, wherein said gel compound contains at least one ceramic powder.
Claim 6
Dependent Claim
17 words
The method of claim 4, wherein said ceramic powder comprises at least one of whiskers and mica.
Claim 7
Dependent Claim
20 words
The method of claim 1, wherein said gel compound is heated during extrusion around the outer periphery of said conductor.
Claim 8
Dependent Claim
12 words
The method of claim 1, wherein said thermoplastic polymer contains silicone resin.
Claim 9
Dependent Claim
33 words
The method of claim 1, wherein a dehydration/condensation reaction and a polycondensation reaction are caused by adding water and an acid catalyst in step (a) for gelation for forming said extrudable gel compound.
Claim 10
Dependent Claim
24 words
The method of claim 1, wherein said extruding step forms on said conductor a gel coating having a thickness of at least 30 μm.
References Cited (Backward Citations)
GB2185011A
Cited
US4921731A
Cited
JPS63195283A
Cited
JPS63281313A
Cited
JPS6452338A
Cited
JPH01192006A
Cited
US5028489A
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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) | 1995-08-18 | 1996-02-17 | 1996-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-18 | 2000-02-17 | 2000-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-18 | 2004-02-17 | 2004-08-18 | $7700.00 | Window Closed / Lapsed |