Patent US4210431A successfully refreshed from Google Patents.
US4210431A
Expired / Lapsed
US
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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 22:33
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)
US2016139A
Cited
US3300334A
Cited
US3428519A
Cited
US3791847A
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NL7602397A
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 |