Patent US3569602A successfully refreshed from Google Patents.
US3569602A
Expired / Lapsed
US
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Temperature programming apparatus with a heating sensing arrangement
Assignee: Applied Biosystems Inc
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Filing: 1969-07-07
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Granted: 1971-03-09
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Expires: 1989-07-07
Abstract
Abstract An apparatus for varying the temperature of a material over a range of temperatures in a programmed manner includes an electric furnace which is heated both by a heater element which exhibits a relatively nonlinear resistance-temperature characteristic and a linearizing electrical impedance coupled to the element to provide a relatively linear resultant resistance-temperature characteristic. The heating element and linearizing impedance are positioned with respect to the furnace for transferring to the furnace thermal energy created by the dissipation of electrical energy therein.
Inventors
- 👤 Stanley Norem
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:34
CPC Classifications
G; G01; G01K; G01K1/00; G01K1/14; F; F27; F27D; F27D11/00; F27D11/02; H; H05; H05B; H05B3/00; H05B3/0019
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
121 words
In an apparatus adapted for varying the temperature of a material over a range of temperatures and including an electric furnace having an electrical heating element positioned with respect to the furnace for applying energy to the furnace for heating a material positioned therein, and a circuit means coupled to said heating element for applying electrical heating energy thereto, the improvement comprising, an electrical linearizing element coupled to said heating element and to said circuit means for increasing the linearity of a resistancetemperature characteristic thereof, said linearizing element positioned with respect to said furnace for applying to said furnace thermAl energy created by the dissipation of electrical energy in said linearizing element for thereby heating the material positioned in the furnace.
Claim 2
Dependent Claim
121 words
In an apparatus adapted for varying the temperature of a material over a range of temperatures and including an electric furnace having an electrical heating element positioned with respect to the furnace for applying energy to the furnace for heating a material positioned therein, and a circuit means coupled to said heating element for applying electrical heating energy thereto, the improvement comprising, an electrical linearizing element coupled to said heating element and to said circuit means for increasing the linearity of a resistancetemperature characteristic thereof, said linearizing element positioned with respect to said furnace for applying to said furnace thermAl energy created by the dissipation of electrical energy in said linearizing element for thereby heating the material positioned in the furnace.
Claim 3
Dependent Claim
17 words
The apparatus of claim 1 wherein said linearizing element is coupled in parallel with said heating element.
Claim 4
Dependent Claim
45 words
The apparatus of claim 1 wherein said circuit means is arranged for alternately applying electrical energy to said heating element and to said linearizing element and for sensing the resistance of said elements and providing an electrical signal indicative of the temperature of said furnace.
Claim 5
Dependent Claim
161 words
In an analytical instrument adapted for varying the temperature of a sample material under analysis over a programmed range of temperatures and for providing an indication of the occurrence of a variation of a characteristic of a sample material, said instrument having an electric furnace including an electrical heating element positioned for applying thermal energy to said furnace when a current flows in said element, said element having a nonlinear resistance-temperature characteristic, a circuit means coupled to said heating element for varying the sample material temperature by alternately applying electrical energy thereto for heating said element and for sensing the impedance of said element and providing an electrical indication representative of the temperature of said furnace, the improvement comprising an electrical linearizing element coupled in parallel circuit with said heating element and to said circuit means and positioned with respect to said furnace for coupling thermal energy to said furnace resulting from the dissipation of electrical energy in said linearizing element.
Claim 6
Dependent Claim
161 words
In an analytical instrument adapted for varying the temperature of a sample material under analysis over a programmed range of temperatures and for providing an indication of the occurrence of a variation of a characteristic of a sample material, said instrument having an electric furnace including an electrical heating element positioned for applying thermal energy to said furnace when a current flows in said element, said element having a nonlinear resistance-temperature characteristic, a circuit means coupled to said heating element for varying the sample material temperature by alternately applying electrical energy thereto for heating said element and for sensing the impedance of said element and providing an electrical indication representative of the temperature of said furnace, the improvement comprising an electrical linearizing element coupled in parallel circuit with said heating element and to said circuit means and positioned with respect to said furnace for coupling thermal energy to said furnace resulting from the dissipation of electrical energy in said linearizing element.
Claim 7
Dependent Claim
18 words
The instrument of claim 4 wherein said heating element is positioned about an outer surface of said furnace.
Claim 8
Dependent Claim
18 words
The instrument of claim 5 wherein said linearizing element is positioned about an outer surface of said furnace.
Claim 9
Dependent Claim
59 words
The instrument of claim 6 wherein said heating element is formed by a wire foil disposed on a first insulating support body which is formed about the outer surface of said furnace and said linearizing element is formed of a wire foil positioned on a second insulating support body which is formed about an outer surface of said furnace.
Claim 10
Dependent Claim
13 words
The instrument of claim 7 wherein said heating element is formed of nickel.
Claim 11
Dependent Claim
14 words
The instrument of claim 8 wherein said linearizing element is formed of Nichrome V.
Claim 12
Dependent Claim
19 words
The instrument of claim 4 wherein said linearizing element has a resistance-temperature coefficient of resistance which is substantially zero.
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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) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |