Patent US4491618A successfully refreshed from Google Patents.
US4491618A
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Reconstituted mica materials, reconstituted mica prepreg materials, reconstituted mica products and insulated coils
Assignee: Resonac Corp
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Filing: 1981-11-06
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Granted: 1985-01-01
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Expires: 2001-11-06
Abstract
Abstract A reconstituted mica material produced by sheet forming a slurry containing mica flakes prepared by disintegrating unfired mica and comprising (i) mica flakes having a particle size of 1.0 mm or more and an aspect ratio of 150 or more, (ii) mica flakes having a particle size of 0.25 mm or more and less than 1.0 mm and (iii) mica flakes having a particle size of less than 0.25 mm, in definite ranges, gives reconstituted mica prepreg materials, reconstituted mica products and insulated coils having excellent mechanical and electrical properties.
Inventors
- 👤 Hideji Kuwajima
- 👤 Kazuyoshi Shike
- 👤 Takeyoshi Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:16
CPC Classifications
C; C04; C04B; C04B14/00; C04B14/02; C04B14/04; C04B14/20; C04B26/00; C04B26/02; C04B28/00; C04B28/34; C04B30/00; C08; C08J; C08J5/00; C08J5/24; C08J5/248; H; H01; H01B; H01B3/00; H01B3/02; H01B3/04; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/251; Y10T428/29; Y10T428/2911; Y10T442/00; Y10T442/30; Y10T442/3927; Y10T442/3935; Y10T442/3976
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
91 words
A reconstituted mica material produced by sheet forming a slurry containing mica flakes prepared by disintegrating unfired mica and comprising: (i) 30 to 70 parts by weight of mica flakes having a particle size of 1.0 mm or more and an aspect ratio of 150 or more, (ii) 20 to 40 parts by weight of mica flakes having a particle size of 0.25 mm or more and less than 1.0 mm, and (iii) 10 to 30 parts by weight of mica flakes having a particle size of less than 0.25 mm.
Claim 2
Dependent Claim
91 words
A reconstituted mica material produced by sheet forming a slurry containing mica flakes prepared by disintegrating unfired mica and comprising: (i) 30 to 70 parts by weight of mica flakes having a particle size of 1.0 mm or more and an aspect ratio of 150 or more, (ii) 20 to 40 parts by weight of mica flakes having a particle size of 0.25 mm or more and less than 1.0 mm, and (iii) 10 to 30 parts by weight of mica flakes having a particle size of less than 0.25 mm.
Claim 3
Dependent Claim
20 words
A reconstituted mica material according to claim 1, which further comprises a backing material bound to the reconstituted mica material.
Claim 4
Dependent Claim
28 words
A reconstituted mica material according to claim 2, wherein the backing material is woven fabric, nonwoven fabric or film made from an organic material or an inorganic material.
Claim 5
Dependent Claim
18 words
A reconstituted mica material according to claim 1, wherein said slurry contains 0.5 to 2% by weight mica.
Claim 6
Dependent Claim
117 words
A reconstituted mica prepreg material produced by sheet forming a slurry containing mica flakes prepared by disintegrating unfired mica and comprising: (i) 30 to 70 parts by weight of mica flakes having a particle size of 1.0 mm ormore and an aspect ratio of 150 or more, (ii) 20 to 40 parts by weight of mica flakes having a particle size of 0.25 mm or more and less than 1.0 mm, and (iii) 10 to 30 parts by weight of mica flakes having a particle size of less than 0.25 mm, to give a reconstituted mica material, impregnating or coating the reconstituted mica material with a thermosetting resin composition, and partially curing the impregnated or coated resin.
Claim 7
Dependent Claim
117 words
A reconstituted mica prepreg material produced by sheet forming a slurry containing mica flakes prepared by disintegrating unfired mica and comprising: (i) 30 to 70 parts by weight of mica flakes having a particle size of 1.0 mm ormore and an aspect ratio of 150 or more, (ii) 20 to 40 parts by weight of mica flakes having a particle size of 0.25 mm or more and less than 1.0 mm, and (iii) 10 to 30 parts by weight of mica flakes having a particle size of less than 0.25 mm, to give a reconstituted mica material, impregnating or coating the reconstituted mica material with a thermosetting resin composition, and partially curing the impregnated or coated resin.
Claim 8
Dependent Claim
37 words
A reconstituted mica prepreg material according to claim 5, wherein the reconstituted mica material is bound to a backing material after impregnation or coating with the thermosetting resin composition and before partial curing of the resin composition.
Claim 9
Dependent Claim
31 words
A reconstituted mica prepreg material according to claim 5 or 6, wherein thethermosetting resin composition contains as a resin component an epoxy resin, an unsaturated polyester resin or a silicone resin.
Claim 10
Dependent Claim
29 words
A reconstituted mica prepreg material according to claim 6, wherein the backing material is woven fabric, nonwoven fabric or film made from an organic material or an inorganic material.
Claim 11
Dependent Claim
122 words
A reconstituted mica product produced by sheet forming a slurry containing mica flakes prepared by disintegrating unfired mica and comprising: (i) 30 to 70 parts by weight of mica flakes having a particle size of 1.0 mm or more and an aspect ratio of 150 or more, (ii) 20 to 40 parts by weight of mica flakes having a particle size of 0.25 mm or more and less than 1.0 mm, and (iii) 10 to 30 parts by weight of mica flakes having a particle size of less than 0.25 mm, to give a reconstituted mica material, impregnating or coating the reconstituted mica material with a thermosetting resin composition or an inorganic composition, and molding the resulting material with heating under pressure.
Claim 12
Dependent Claim
122 words
A reconstituted mica product produced by sheet forming a slurry containing mica flakes prepared by disintegrating unfired mica and comprising: (i) 30 to 70 parts by weight of mica flakes having a particle size of 1.0 mm or more and an aspect ratio of 150 or more, (ii) 20 to 40 parts by weight of mica flakes having a particle size of 0.25 mm or more and less than 1.0 mm, and (iii) 10 to 30 parts by weight of mica flakes having a particle size of less than 0.25 mm, to give a reconstituted mica material, impregnating or coating the reconstituted mica material with a thermosetting resin composition or an inorganic composition, and molding the resulting material with heating under pressure.
Claim 13
Dependent Claim
43 words
A reconstituted mica product according to claim 9, wherein the reconstituted mica material is impregnated or coated with the thermosetting resin composition, and the thermosetting resin composition contains as a resin component an epoxy resin, an unsaturated polyester resin, or a silicone resin.
Claim 14
Dependent Claim
34 words
A reconstituted mica product according to claim 9, wherein the reconstituted mica material is impregnated or coated with the inorganic composition, and the inorganic composition is a mixture of alumina sol and orthophosphoric acid.
Claim 15
Dependent Claim
36 words
A reconstituted mica product according to claim 9, wherein the reconstituted mica material is impregnated or coated with an inorganic composition, with said inorganic composition being a composition including aluminum phosphate, borosilicate glass or silicate glass.
Claim 16
Dependent Claim
155 words
An insulated electrical coil comprising an electrical conductor and an insulating layer wrapped around said conductor, said insulating layer comprises: (a) 60 to 85 parts by weight of reconstituted mica material produced by sheet forming a slurry containing mica flakes prepared by disintegrating unfired mica and comprising: (i) 30 to 70 parts by weight of mica flakes having a particle size of 1.0 mm or more and an aspect ratio of 150 or more, (ii) 20 to 40 parts by weight of mica flakes having a particle size of 0.25 mm or more and less than 1.0 mm, and (iii) 10 to 30 parts by weight of mica flakes having a particle size of less than 0.25 mm, (b) 10 to 30 parts by weight of a thermosetting resin composition, and (c) 15 parts by weight or less of a backing material, the total weight of (a), (b) and (c) being 100 parts by weight.
Claim 17
Dependent Claim
155 words
An insulated electrical coil comprising an electrical conductor and an insulating layer wrapped around said conductor, said insulating layer comprises: (a) 60 to 85 parts by weight of reconstituted mica material produced by sheet forming a slurry containing mica flakes prepared by disintegrating unfired mica and comprising: (i) 30 to 70 parts by weight of mica flakes having a particle size of 1.0 mm or more and an aspect ratio of 150 or more, (ii) 20 to 40 parts by weight of mica flakes having a particle size of 0.25 mm or more and less than 1.0 mm, and (iii) 10 to 30 parts by weight of mica flakes having a particle size of less than 0.25 mm, (b) 10 to 30 parts by weight of a thermosetting resin composition, and (c) 15 parts by weight or less of a backing material, the total weight of (a), (b) and (c) being 100 parts by weight.
Claim 18
Dependent Claim
29 words
An insulated electrical coil according to claim 13, wherein the thermosetting resin composition contains as a resin component an epoxy resin, an unsaturated polyester resin, or a silicone resin.
Claim 19
Dependent Claim
36 words
An insulated electrical coil according to claim 13, wherein the backing material is bound to the reconstituted mica material and is woven fabric, nonwoven fabric or film made from an organic material or an inorganic material.
Claim 20
Dependent Claim
39 words
An insulated electrical coil according to claim 13, wherein the backing material is woven fabric, nonwoven fabric or film made from a polyester, polyamide, glass, or a combination of polyester or polyamide and glass yarns or polyester fiber yarns.
References Cited (Backward Citations)
US4105984A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-01 | 1988-07-02 | 1989-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-01 | 1992-07-02 | 1993-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-01 | 1996-07-02 | 1997-01-01 | $7700.00 | Window Closed / Lapsed |