US4944975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite coil forms for electrical systems
Assignee: EIDP Inc
•
Filing: 1988-10-03
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Granted: 1990-07-31
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Expires: 2008-10-03
Abstract
Abstract An electrical coil form having a UL 1446 rating greater than 200° C. is formed from either a thermoplastic or thermosetting resin material reinforced with continuous or long chopped or stretch broken aramid or glass fibers or aramid paper.
Inventors
- 👤 M. Lana Sheer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:25
CPC Classifications
H; H01; H01F; H01F5/00; H01F5/02; Y; Y10; Y10S; Y10S428/00; Y10S428/902; Y10S428/92; Y10T; Y10T428/00; Y10T428/13; Y10T428/131; Y10T428/1314; Y10T428/1352; Y10T428/1362; Y10T428/1366; Y10T428/1369; Y10T428/29; Y10T428/2913; Y10T428/298; Y10T428/31504; Y10T428/31511; Y10T428/31525; Y10T428/31721; Y10T428/31725; Y10T428/31728; Y10T442/00; Y10T442/20; Y10T442/2475; Y10T442/2631
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
A coil form for an electrical device comprising: a structure of an aramid prepreg impregnated with an electrically insulating resin, said structure having a longitudinal passage therethrough, a continuous outer peripheral surface forming support for a coil wound thereon and structural stability and a UL Standard 1446 rating of greater than 200° C., said aramid prepreg having fibers greater than 1/4 inch in length, said aramid prepreg being an aramid paper which is a blend of Kevlar® aramid and a Nomex® aramid in an 85% to 15% by weight ratio, respectively.
Claim 2
Dependent Claim
91 words
A coil form for an electrical device comprising: a structure of an aramid prepreg impregnated with an electrically insulating resin, said structure having a longitudinal passage therethrough, a continuous outer peripheral surface forming support for a coil wound thereon and structural stability and a UL Standard 1446 rating of greater than 200° C., said aramid prepreg having fibers greater than 1/4 inch in length, said aramid prepreg being an aramid paper which is a blend of Kevlar® aramid and a Nomex® aramid in an 85% to 15% by weight ratio, respectively.
References Cited (Backward Citations)
US4076869A
Cited
US3833182A
Cited
US4375527A
Cited
US4429294A
Cited
US4532275A
Cited
US4421806A
Cited
US4492779A
Cited
US4595616A
Cited
US4504532A
Cited
US4608300A
Cited
US4734321A
Cited
US4595620A
Cited
US4579773A
Cited
US4663225A
Cited
US4814222A
Cited
US4701735A
Cited
US4826724A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-07-30 | 1994-01-29 | 1994-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-30 | 1998-01-29 | 1998-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-30 | 2002-01-29 | 2002-07-31 | $7700.00 | Window Closed / Lapsed |