US4418241A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulated coil
Assignee: Mitsubishi Electric Corp
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Filing: 1982-01-06
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Granted: 1983-11-29
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Expires: 2002-01-06
Abstract
Abstract An insulated coil formed by a method, comprising: (a) heat bonding an integrated mica sheet (1) to an aromatic polyamide fibril sheet (2), said integrated mica sheet obtained by forming a mixture of mica flakes and aromatic polyamide fibrils into a sheet and said aromatic polyamide fibril sheet obtained by impregnating an insulating cloth or glass fiber cloth with aromatic polyamide fibrils; (b) treating the integrated sheet material obtained with a thermosetting resin; (c) wrapping an electric conductor with the integrated sheet material; (d) impregnating the wrapped electric conductor with a thermosetting resin under the force of a vacuum or a vacuum-pressure treatment, and (e) molding the resin impregnated wrapped conductor while heating the same.
Inventors
- 👤 Kenzou Fujiwara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:55
CPC Classifications
H; H01; H01B; H01B13/00; H01B13/06; H01B13/065; C; C08; C08J; C08J5/00; C08J5/04; H01B3/00; H01B3/02; H01B3/04; H01B3/18; H01B3/30; H01B3/40; H01F; H01F41/00; H01F41/02; H01F41/04; H01F41/12; H01F41/122; H01F41/127; H02; H02K; H02K3/00; H02K3/32; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/251; Y10T428/29; Y10T428/2911
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
115 words
An insulated coil formed by a method, comprising: (a) heat bonding an integrated mica sheet (1) to an aromatic polyamide fibril sheet (2), said integrated mica sheet obtained by forming a mixture of mica flakes and aromatic polyamide fibrils into a sheet and said aromatic polyamide fibril sheet obtained by impregnating an insulating cloth or glass fiber cloth with aromatic polyamide fibrils; (b) treating the integrated sheet material obtained with a thermosetting resin; (c) wrapping an electric conductor with the integrated sheet material; (d) impregnating the wrapped electric conductor with a thermosetting resin under the force of a vacuum or a vacuum-pressure treatment; and (e) molding the resin impregnated wrapped conductor while heating the same.
Claim 2
Dependent Claim
115 words
An insulated coil formed by a method, comprising: (a) heat bonding an integrated mica sheet (1) to an aromatic polyamide fibril sheet (2), said integrated mica sheet obtained by forming a mixture of mica flakes and aromatic polyamide fibrils into a sheet and said aromatic polyamide fibril sheet obtained by impregnating an insulating cloth or glass fiber cloth with aromatic polyamide fibrils; (b) treating the integrated sheet material obtained with a thermosetting resin; (c) wrapping an electric conductor with the integrated sheet material; (d) impregnating the wrapped electric conductor with a thermosetting resin under the force of a vacuum or a vacuum-pressure treatment; and (e) molding the resin impregnated wrapped conductor while heating the same.
Claim 3
Dependent Claim
19 words
The insulated coil of claim 1, wherein said aromatic polyamide fibril sheet is obtained by a hot calendering technique.
Claim 4
Dependent Claim
51 words
The insulated coil of claim 1, which further comprises a laminated mica structure formed by supporting said complex integrated mica bonded sheet on a backing support of a porous, insulating glass fiber cloth, a nonwoven polyester fabric, a film not provided with split mica or a sheet of aromatic polyamide fibrils.
Claim 5
Dependent Claim
51 words
The insulated coil of claim 3, which further comprises a laminated mica structure formed by supporting said complex integrated mica bonded sheet on a backing support of a porous, insulating glass fiber cloth, a nonwoven polyester fabric, a film not provided with split mica or a sheet of aromatic polyamide fibrils.
Claim 6
Dependent Claim
56 words
The insulated coil of claim 1, wherein the taped coil is formed by winding said coil with said complex integrated mica bonded sheet and a split mica tape or sheet prepared by supporting split mica on a porous insulating glass fiber cloth, polyester nonwoven fabric or film support and impregnating the support with a thermosetting resin.
Claim 7
Dependent Claim
56 words
The insulated coil of claim 2, wherein the taped coil is formed by winding said coil with said complex integrated mica bonded sheet and a split mica tape or sheet prepared by supporting split mica on a porous insulating glass fiber cloth, polyester nonwoven fabric or film support and impregnating the support with a thermosetting resin.
Claim 8
Dependent Claim
34 words
The insulated coil of claim 1, wherein the amount of said thermosetting resin combined with 100 parts by weight of said complex integrated mica bonded sheet ranges from 0.1 to 20 parts by weight.
Claim 9
Dependent Claim
24 words
The insulated coil of claim 1, wherein said thermosetting resin is an epoxy resin, an unsaturated polyester, an esterimide, a silicone or a polyamide.
Claim 10
Dependent Claim
29 words
The insulated coil of claim 1, wherein said integrated mica sheet comprises from 0.1-5 parts by weight of aromatic polyamide fibrils per 100 parts by weight of mica flakes.
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) | 1986-11-28 | 1987-05-30 | 1987-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-28 | 1991-05-30 | 1991-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-28 | 1995-05-30 | 1995-11-29 | $7700.00 | Window Closed / Lapsed |