US3566079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature linearization circuit
Assignee: Applied Biosystems Inc
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Filing: 1968-10-11
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Granted: 1971-02-23
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Expires: 1988-10-11
Abstract
Abstract A temperature-programming arrangement includes a source of voltage Vo having a magnitude which varies over a period of time in accordance with a predetermined temperature program, and, a resistance thermometer positioned adjacent a sample to be temperature programmed. Circuit means are provided for applying a portion of the voltage Vo to said resistance thermometer for causing a linearizing component of current to flow therein.
Inventors
- 👤 Michael J O'neill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:07
CPC Classifications
G; G01; G01K; G01K7/00; G01K7/16; G01K7/18; G01K7/20; G01K7/21; G01N; G01N25/00; G01N25/20; G01N25/48; G01N25/4806; G01N25/4826; G05; G05B; G05B19/00; G05B19/02; G05B19/04; G05B19/07; G05B19/075; G05D; G05D23/00; G05D23/19; G05D23/20; G05D23/24; G05D23/2401
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
124 words
An apparatus for varying the temperature of a substance over a range of temperatures in a predetermined manner said apparatus having a resistive temperature-sensing element positioned adjacent the substance, means coupled to said element for causing a sensing current to flow in said element for generating a voltage Vt indicative of sample temperature, voltage source means for providing a voltage Vo having an amplitude which is representative of temperature in the programmed range and which varies in a predetermined manner over the temperature range, and a means for increasing the linearity of the voltage indication Vt comprising a circuit means coupling a portion of said voltage Vo from said source to said resistive element for causing a linearizing current to flow in said element.
Claim 2
Independent Claim
124 words
An apparatus for varying the temperature of a substance over a range of temperatures in a predetermined manner said apparatus having a resistive temperature-sensing element positioned adjacent the substance, means coupled to said element for causing a sensing current to flow in said element for generating a voltage Vt indicative of sample temperature, voltage source means for providing a voltage Vo having an amplitude which is representative of temperature in the programmed range and which varies in a predetermined manner over the temperature range, and a means for increasing the linearity of the voltage indication Vt comprising a circuit means coupling a portion of said voltage Vo from said source to said resistive element for causing a linearizing current to flow in said element.
Claim 3
Dependent Claim
20 words
The apparatus of claim 1 wherein said temperature-sensing element is positioned adjacent to and spaced apart from the sample substance.
Claim 4
Dependent Claim
26 words
The apparatus of claim 2 wherein said means for providing a voltage Vo is adapted for providing a varying voltage Vo of positive or negative polarity.
Claim 5
Dependent Claim
59 words
The apparatus of claim 3 wherein said means for causing a sensing current to flow in said element includes a source of electrical potential and an electrical impedance coupled in a series circuit arrangement with said element and said circuit means couples a portion of said voltage Vo to a junction of said electrical impedance and said sensing element.
Claim 6
Dependent Claim
50 words
The apparatus of claim 4 wherein said circuit means for providing the voltage Vo provides a second phase differing voltage -Vo, a voltage divider having means for deriving a portion of the voltage applied across said divider, and means for applying said voltages Vo and -Vo to said voltage divider.
Claim 7
Dependent Claim
41 words
The apparatus of claim 2 including voltage dividing impedance means having an output terminal, and said circuit means couples said voltage Vo to said voltage divider, and circuit means for applying a portion of said voltage Vo to said output terminal.
Claim 8
Dependent Claim
27 words
The apparatus of claim 6 including impedance means coupled to said terminal for altering the characteristic of the indicated temperature vs. true temperature of the sensing element.
Claim 9
Dependent Claim
194 words
In an analytical instrument for temperature programming a substance over a range of preselected temperatures, said instrument including thermal transfer means for altering the temperature of a sample, a resistive temperature-sensing element positioned near said sample for sensing the temperature of said sample, circuit means including a source of DC potential and a resistive impedance coupled in series with said sensing means for causing a sensing current to flow in said element and establishing a voltage Vt indicative of the temperature of said sample, circuit means for providing a voltage Vo having an amplitude which is representative of temperatures in the programmed range and which varies in a predetermined manner over the programmed range, voltage dividing means for providing at an output terminal thereof a voltage Vsp representing a desired setpoint temperature, means for applying said program voltage Vo to said voltage divider, circuit means for detecting a variation in amplitude between the voltages Vt and Vsp and for causing an exchange of thermal energy with said element in a manner for equilibrating said voltages, and circuit means including a resistive impedance for coupling a portion of the voltage Vo to said sensing element.
Claim 10
Dependent Claim
194 words
In an analytical instrument for temperature programming a substance over a range of preselected temperatures, said instrument including thermal transfer means for altering the temperature of a sample, a resistive temperature-sensing element positioned near said sample for sensing the temperature of said sample, circuit means including a source of DC potential and a resistive impedance coupled in series with said sensing means for causing a sensing current to flow in said element and establishing a voltage Vt indicative of the temperature of said sample, circuit means for providing a voltage Vo having an amplitude which is representative of temperatures in the programmed range and which varies in a predetermined manner over the programmed range, voltage dividing means for providing at an output terminal thereof a voltage Vsp representing a desired setpoint temperature, means for applying said program voltage Vo to said voltage divider, circuit means for detecting a variation in amplitude between the voltages Vt and Vsp and for causing an exchange of thermal energy with said element in a manner for equilibrating said voltages, and circuit means including a resistive impedance for coupling a portion of the voltage Vo to said sensing element.
Claim 11
Dependent Claim
25 words
The apparatus of claim 8 including a resistive impedance for coupling a portion of the voltage Vo to the output terminal of said voltage divider.
Claim 12
Dependent Claim
15 words
The apparatus of claim 1 wherein said resistive temperature sensing element comprises a resistance coil.
References Cited (Backward Citations)
US3316765A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |