US4167403A — Apparatus and method for maintaining calibration …

Claim 1

Independent Claim 90 words

In combination with a platinum/rhodium bushing for the drawing of glass fiber, an improved thermocouple connection for sensing the temperature of the bushing, said connection comprising: a first lead of platinum and a second lead of a platinum/rhodium alloy; a thermocouple junction between said leads at and in contact with the bushing; and extended portions of said leads extending directly from the bushing and over a length so closely adjacent the bushing that the temperature of the leads over said length is substantially equal to the temperature of the bushing.

Claim 2

Dependent Claim 90 words

In combination with a platinum/rhodium bushing for the drawing of glass fiber, an improved thermocouple connection for sensing the temperature of the bushing, said connection comprising: a first lead of platinum and a second lead of a platinum/rhodium alloy; a thermocouple junction between said leads at and in contact with the bushing; and extended portions of said leads extending directly from the bushing and over a length so closely adjacent the bushing that the temperature of the leads over said length is substantially equal to the temperature of the bushing.

Claim 3

Dependent Claim 30 words

In a combination according to claim 1 wherein the bushing is laterally confined within a blcok of refractory material, the improvement wherein the leads are disposed within said refractory material.

Claim 4

Dependent Claim 34 words

In a combination according to claim 1 wherein the bushing is an alloy of 80% platinum and 20% rhodium, the improvement wherein the second lead is an alloy of 87% platinum and 13% rhodium.

Claim 5

Dependent Claim 47 words

In a combination according to claim 1 wherein the bushing is of elongate configuration with an orifice plate extending over the lower side thereof, the improvement wherein the junction is immediately adjacent the orifice plate and the extended portions of the leads extend lengthwise of the bushing.

Claim 6

Dependent Claim 50 words

In a combination according to claim 1, the improvement wherein the junction comprises: a pair of apertures extending through the bushing; portions of said respective leads extending through said apertures and into the interior of the bushing; and weld means connecting said leads to one another and to said bushing.

Claim 7

Dependent Claim 23 words

In a combination according to claim 5, the improvement wherein the weld means connects the leads together to the interior of the bushing.

Claim 8

Dependent Claim 95 words

In combination with a platinum/rhodium bushing for the drawing of glass fiber and a thermocouple connection for said bushing having first lead of platinum and a second lead of a platinum/rhodium alloy joined to one another at a junction on the bushing, a method of maintaining the calibration of said thermocouple connection substantially constant as the bushing ages, said method comprising extending said leads directly from the bushing and over a length so closely adjacent the bushing that the temperature of said leads over said length is substantially equal to the temperature of the bushing.

Claim 9

Dependent Claim 95 words

In combination with a platinum/rhodium bushing for the drawing of glass fiber and a thermocouple connection for said bushing having first lead of platinum and a second lead of a platinum/rhodium alloy joined to one another at a junction on the bushing, a method of maintaining the calibration of said thermocouple connection substantially constant as the bushing ages, said method comprising extending said leads directly from the bushing and over a length so closely adjacent the bushing that the temperature of said leads over said length is substantially equal to the temperature of the bushing.

Claim 10

Dependent Claim 95 words

In combination with a platinum/rhodium bushing for the drawing of glass fiber, an improved thermocouple connection for sensing the temperature of the bushing, said connection comprising: first and second leads, one of said leads having a high rhodium content relative to the other; a thermocouple junction between said leads at and in contact with the bushing; and, extended portions of said leads extending directly from the bushing and over a length so closely adjacent to the bushing that the temperature of the leads over said length is substantially equal to the temperature of the bushing.

Claim 11

Dependent Claim 95 words

In combination with a platinum/rhodium bushing for the drawing of glass fiber, an improved thermocouple connection for sensing the temperature of the bushing, said connection comprising: first and second leads, one of said leads having a high rhodium content relative to the other; a thermocouple junction between said leads at and in contact with the bushing; and, extended portions of said leads extending directly from the bushing and over a length so closely adjacent to the bushing that the temperature of the leads over said length is substantially equal to the temperature of the bushing.

Claim 12

Dependent Claim 105 words

In combination with a metallic bushing for the drawing of glass fiber and a thermocouple connected to the bushing to sense bushing temperature, said thermocouple comprising dissimilar metallic leads connected to the bushing, at least one of which leads as the property of forming an alloy with the material of the bushing whereby the interface between the leads migrates, an improved method of maintaining the calibration of said thermocouple comprising extending said one lead directly from the bushing and over a length so closely adjacent the bushing that the temperature of said lead over said length is substantially equal to the temperature of the bushing.

Claim 13

Dependent Claim 105 words

In combination with a metallic bushing for the drawing of glass fiber and a thermocouple connected to the bushing to sense bushing temperature, said thermocouple comprising dissimilar metallic leads connected to the bushing, at least one of which leads as the property of forming an alloy with the material of the bushing whereby the interface between the leads migrates, an improved method of maintaining the calibration of said thermocouple comprising extending said one lead directly from the bushing and over a length so closely adjacent the bushing that the temperature of said lead over said length is substantially equal to the temperature of the bushing.

Claim 14

Dependent Claim 46 words

In a combination according to claim 9, the improved method wherein both of said leads extend directly from the bushing over a length so closely adjacent the bushing that the temperature of said leads over said length is substantially equal to the temperature of the bushing.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1982-09-10	1983-03-12	1983-09-11	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1986-09-10	1987-03-12	1987-09-11	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1990-09-10	1991-03-12	1991-09-11	$7700.00	Window Closed / Lapsed

Apparatus and method for maintaining calibration of a thermocouple used in a bushing for the drawing of glass fiber

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