US4210431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making vitreous carbon coatings on glass fibers
Assignee: Corning Glass Works
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Filing: 1978-12-15
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Granted: 1980-07-01
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Expires: 1998-12-15
Abstract
Abstract There is disclosed a highly refractory substrate having a vitreous carbon coating formed on its surface, and a method of forming such coating by contacting the substrate, while hot, with an organic material in liquid form. In one form, the substrate is a drawn glass filament which may be coated as part of the drawing operation, and which may, for example, be an optical filament useful in an optical waveguide system.
Inventors
- 👤 David L. Bachman
- 👤 Francis W. Voorhees
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:08
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/45; C04B41/50; C04B41/5001; C03; C03C; C03C17/00; C03C17/22; C03C25/00; C03C25/10; C03C25/104; C03C25/106; C03C25/1061; C03C25/1062; C03C2217/00; C03C2217/20; C03C2217/28; C03C2217/282; C03C2218/00; C03C2218/10; C03C2218/11
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
135 words
A method for producing a vitreous carbon coating on the surface of a highly refractory substrate which comprises the steps: (a) providing a highly refractory substrate that is at a temperature in excess of about 1000° C.; (b) bringing said hot substrate into contact with a thermally decomposable organic material in liquid form, the temperature of said liquid being less than about 400° C. and said organic material having a flash point in excess of 200° F.; (c) maintaining said contact for a sufficient length of time to thermally decompose said organic material to from a vitreous carbon coating on the surface of said substrate; (d) cooling said substrate while in contact with said organic material to a temperature below about 400° C.; and thereafter (e) removing said substrate from contact with said organic material.
Claim 2
Independent Claim
135 words
A method for producing a vitreous carbon coating on the surface of a highly refractory substrate which comprises the steps: (a) providing a highly refractory substrate that is at a temperature in excess of about 1000° C.; (b) bringing said hot substrate into contact with a thermally decomposable organic material in liquid form, the temperature of said liquid being less than about 400° C. and said organic material having a flash point in excess of 200° F.; (c) maintaining said contact for a sufficient length of time to thermally decompose said organic material to from a vitreous carbon coating on the surface of said substrate; (d) cooling said substrate while in contact with said organic material to a temperature below about 400° C.; and thereafter (e) removing said substrate from contact with said organic material.
Claim 3
Dependent Claim
12 words
The method of claim 1 wherein said substrate is a silica glass.
Claim 4
Dependent Claim
12 words
The method of claim 1 wherein said substrate is a glass filament.
Claim 5
Dependent Claim
36 words
The method of claim 3 wherein said glass filament is drawn from a thermally softened glass blank and, while still above 1000° C. in temperature, is brought into contact with an organic material in liquid form.
Claim 6
Dependent Claim
29 words
The method of claim 1 wherein said hot substrate is brought into contact with said organic material by immersing into a bath of the organic material in liquid form.
Claim 7
Dependent Claim
18 words
The method of claim 5 wherein said substrate is a glass filament that is drawn through the bath.
Claim 8
Dependent Claim
24 words
The method of claim 5 wherein said organic material is normally solid and is liquefied by heating to a temperature below its decomposition temperature.
Claim 9
Dependent Claim
29 words
The method of claim 5 wherein said immersion is continued until the temperature of the substrate is not over 400° C., the coated substrate then being removed and cleaned.
Claim 10
Dependent Claim
17 words
The method of claim 8 wherein said substrate is cooled to substantially ambient temperature in the bath.
Claim 11
Dependent Claim
14 words
The method of claim 1 wherein said hydrocarbons and derivatives thereof are monomeric materials.
Claim 12
Dependent Claim
26 words
The method of claim 1 wherein said hydrocarbons and derivatives thereof are selected from the group consisting of paraffins, waxes, olefins, aromatics, glycols, tars, and asphalt.
References Cited (Backward Citations)
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US3428519A
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US3791847A
Cited
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Cited
US4076510A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-07-01 | 1983-12-31 | 1984-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-01 | 1987-12-31 | 1988-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-01 | 1991-12-31 | 1992-07-01 | $7700.00 | Window Closed / Lapsed |