Patent US4944975A successfully refreshed from Google Patents.
US4944975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite coil forms for electrical systems
Assignee: EIDP Inc
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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 19:32
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.
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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) | 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 |