US4534997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-temperature carbon fiber coil and method for producing same
Assignee: Individual
•
Filing: 1984-03-19
•
Granted: 1985-08-13
•
Expires: 2004-03-19
Abstract
Abstract A coil comprising a carbon filament winding with fused particulate insulative coating therearound and method of producing such carbon filament coil.
Inventors
- 👤 Gregory R. Brotz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:26
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/02; H01F41/04; H01F41/12; H01F41/122; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49014; Y10T29/4902; Y10T29/49071
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
128 words
A method of providing an insulative coating on a carbon filament to be wound in a coil, comprising the steps of: providing a spool of carbon filament; drawing a filament from said spool; passing said filament through an adhesive binder bath; coating said filament with said adhesive binder; passing said filament through a powdered insulator; adhering said powdered insulator to said carbon filament by said adhesive binder; passing said insulator-coated filament then through oven means; baking said insulator onto said carbon filament; passing said insulator-coated filament into a firing chamber; winding said insulator-coated filament into a coil; heating said insulator-coated filament at a high temperature as it is wound; and fusing said insulator coating onto said filament to provide insulation of said coil windings from one to another.
Claim 2
Independent Claim
128 words
A method of providing an insulative coating on a carbon filament to be wound in a coil, comprising the steps of: providing a spool of carbon filament; drawing a filament from said spool; passing said filament through an adhesive binder bath; coating said filament with said adhesive binder; passing said filament through a powdered insulator; adhering said powdered insulator to said carbon filament by said adhesive binder; passing said insulator-coated filament then through oven means; baking said insulator onto said carbon filament; passing said insulator-coated filament into a firing chamber; winding said insulator-coated filament into a coil; heating said insulator-coated filament at a high temperature as it is wound; and fusing said insulator coating onto said filament to provide insulation of said coil windings from one to another.
Claim 3
Dependent Claim
68 words
The method of claim 1 further including, before the step of heating said insulator-coated filament at high temperature, the step of: providing a first electrode attached to the core of the coil; providing a second electrode disposed above said coil as it is being wound; and forming an electron plasma within said firing chamber between said first and second electrodes to fuse said insulator coating onto said filament.
Claim 4
Dependent Claim
54 words
The method of claim 1 further including, before the step of heating said coated filament at a high temperature within said firing chamber, the step of: laser-induced fusing of said insulator coating by a laser with its beam aimed upon said coated carbon filament at the point where it is wound onto the coil.
Claim 5
Dependent Claim
37 words
The method of claim 1 further including, before the step of passing said coated filament into a firing chamber, the step of: passing said insulator-coated filament through an atmosphere trap before it enters into said firing chamber.
Claim 6
Independent Claim
31 words
The method of claims 1, 2, 3 and 4 wherein said carbon filament is a carbon precursor or uncarbonized filament that is carbonized by heat during the winding of the coil.
Claim 7
Independent Claim
54 words
A method of producing a carbon filament coil comprising the steps of: combining a carbon filament coil with a particulate insulator; holding said coil and particulate insulator in a predetermined area; excluding oxygen from said coil and particulate insulator; and firing said structure to melt and fuse said insulator around said coils of filament.
Claim 8
Independent Claim
54 words
A method of producing a carbon filament coil comprising the steps of: combining a carbon filament coil with a particulate insulator; holding said coil and particulate insulator in a predetermined area; excluding oxygen from said coil and particulate insulator; and firing said structure to melt and fuse said insulator around said coils of filament.
Claim 9
Dependent Claim
44 words
The method of claim 6 further including, after the step of combining said carbon filament with said particulate insulator, the steps of compressing it in a container and vibrating ultrasonically the container to cause said particulate insulator to surround all of said filament's coils.
Claim 10
Dependent Claim
12 words
The method of claim 6 wherein said particulate insulator is pure silicon.
Claim 11
Dependent Claim
17 words
The method of claim 6 wherein said particulate insulator is a mixture of powdered carbon and silicon.
References Cited (Backward Citations)
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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) | 1988-08-12 | 1989-02-11 | 1989-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-12 | 1993-02-11 | 1993-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-12 | 1997-02-11 | 1997-08-13 | $7700.00 | Window Closed / Lapsed |