US3667294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for thermal analysis
Assignee: EDWARD ORTON JR CERAMIC FOUNDATION
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Filing: 1969-07-23
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Granted: 1972-06-06
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Expires: 1989-07-23
Abstract
Abstract A method and apparatus for high measurement of heat content which includes an electric furnace in which a sample holding container of predetermined dimensions is placed. A pair of differentially connected thermocouples are disposed such that one measures the temperature of the container walls as a reference and the other the temperature of the sample. A source of bias voltage is used to cause the hot junction of the reference thermocouple to be maintained at a given temperature differential above the other thermocouple. A control system is operatively connected to the thermocouples and to the power source of the furnace to vary the amount of heat delivered to the container responsive to maintaining the predetermined temperature differential between the thermocouples as established by the bias voltage. The temperature of the sample is then recorded versis the time required for the temperature of the sample to reach the upper limit of the temperature range of the test run.
Inventors
- 👤 Robert A Schoenlaub
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:57
CPC Classifications
G; G01; G01N; G01N25/00; G01N25/20; G01N25/48; G01N25/4846; G01N25/4866
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
188 words
An apparatus for thermal analysis comprising, in combination, furnace means of relatively high thermal conductivity; a container means disposed within said furnace means for holding a sample to be analyzed; a pair of thermocouples connected to one another in opposing relationship, the first of said pair for measuring the temperature of said container means and the second of said pair disposed within said container for measuring the temperature of a sample disposed therein; a source of bias voltage operatively connected to said thermocouples to produce a voltage signal representing a temperature differential between said thermocouples; control means operatively connected to said source of bias voltage, to said thermocouples and to said furnace means to control the heat delivered by said furnace means to said container means responsive to maintaining said container means at a temperature differential above the temperature of said sample according to the magnitude of said signal produced by said source of bias voltage; and recording means operatively connected to said second thermocouple for recording the temperature of the sample in said chamber versus the time required to heat the sample through a predetermined temperature range.
Claim 2
Independent Claim
188 words
An apparatus for thermal analysis comprising, in combination, furnace means of relatively high thermal conductivity; a container means disposed within said furnace means for holding a sample to be analyzed; a pair of thermocouples connected to one another in opposing relationship, the first of said pair for measuring the temperature of said container means and the second of said pair disposed within said container for measuring the temperature of a sample disposed therein; a source of bias voltage operatively connected to said thermocouples to produce a voltage signal representing a temperature differential between said thermocouples; control means operatively connected to said source of bias voltage, to said thermocouples and to said furnace means to control the heat delivered by said furnace means to said container means responsive to maintaining said container means at a temperature differential above the temperature of said sample according to the magnitude of said signal produced by said source of bias voltage; and recording means operatively connected to said second thermocouple for recording the temperature of the sample in said chamber versus the time required to heat the sample through a predetermined temperature range.
Claim 3
Dependent Claim
36 words
The apparatus defined in claim 1 wherein said container means is composed of a material having a thermal conductivity constant of at east 0.01 cal/cm2/cm/ *C/ sec and a wall thickness of at least 0.15 cm.
Claim 4
Dependent Claim
38 words
The apparatus defined in claim 1 wherein said thermocouple for measuring the temperature of said sample is disposed within said container means at a distance of at least 0.5 cm from the inside surfaces of said container means.
Claim 5
Independent Claim
186 words
An apparatus for thermal analysis of materials comprising, in combination, furnace means of a relatively high thermal conductivity; a container means disposed within said furnace means and including top, bottom and side walls for receiving the sample to be tested; a pair of thermocouples connected to one another in opposing relationship, the first of said pair for measuring the temperature of said walls of said container and the second of said pair disposed in said container means for measuring the temperature of a sample contained therein; a source of bias voltage operatively connected to said thermocouples to establish a voltage signal representing a predetermined temperature differential between said thermocouples; control means operatively connected to said source of bias voltage, to said thermocouples and to said furnace means to control the heat delivered by said furnace means to the walls of said container means responsive to maintaining said predetermined temperature differential between said thermocouples; and recording means operatively connected to said second thermocouple for recording the temperature of a sample in said container means versus the time required to heat the sample through said predetermined temperature range.
Claim 6
Independent Claim
186 words
An apparatus for thermal analysis of materials comprising, in combination, furnace means of a relatively high thermal conductivity; a container means disposed within said furnace means and including top, bottom and side walls for receiving the sample to be tested; a pair of thermocouples connected to one another in opposing relationship, the first of said pair for measuring the temperature of said walls of said container and the second of said pair disposed in said container means for measuring the temperature of a sample contained therein; a source of bias voltage operatively connected to said thermocouples to establish a voltage signal representing a predetermined temperature differential between said thermocouples; control means operatively connected to said source of bias voltage, to said thermocouples and to said furnace means to control the heat delivered by said furnace means to the walls of said container means responsive to maintaining said predetermined temperature differential between said thermocouples; and recording means operatively connected to said second thermocouple for recording the temperature of a sample in said container means versus the time required to heat the sample through said predetermined temperature range.
Claim 7
Dependent Claim
42 words
The apparatus defined in claim 4 wherein said container means is composed of a material having a thermal conductivity constant of at least 0.01 cal/cm2/cm/ *C/ sec and the walls of said container means have a thickness of at least 0.15 cm.
Claim 8
Independent Claim
88 words
A method of thermal analysis of a material comprising thE steps of placing a sample of the material to be analyzed in heat conduction relationship within container composed of heat conducting material of relatively high thermal conductivity; heating the container to cause heat to be conducted to the sample; controlling the temperature of the container responsive to maintaining a predetermined temperature differential between the container and the sample; and recording the temperature of the sample versus the time required to heat the sample through a predetermined temperature range.
Claim 9
Independent Claim
88 words
A method of thermal analysis of a material comprising thE steps of placing a sample of the material to be analyzed in heat conduction relationship within container composed of heat conducting material of relatively high thermal conductivity; heating the container to cause heat to be conducted to the sample; controlling the temperature of the container responsive to maintaining a predetermined temperature differential between the container and the sample; and recording the temperature of the sample versus the time required to heat the sample through a predetermined temperature range.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |