US3558857A — Temperature control system using a nonreentrant t…

Claim 1

Independent Claim 158 words

A temperature measuring device comprising: a. a wheatstone bridge further comprising; 1. two input nodes, 2. two output nodes, and 3. for four impedance legs each connected between a different pair of one input and one output and one output node, b. at least one of a said impedance legs including an element having an impedance which varies significantly as a function of the temperature of the element; c. means for applying electrical power to said input nodes, and d. a series-connected diode and light source directly connected between the output nodes of said bridge, said diode being in a conducting state when said bridge is unbalanced in one direction and in a nonconducting state when said bridge is unbalanced in the other direction, whereby said light source means emits light as a function of the degree of unbalance of said bridge in one direction and emits no light when the bridge is unbalanced in the other direction.

Claim 2

Dependent Claim 158 words

A temperature measuring device comprising: a. a wheatstone bridge further comprising; 1. two input nodes, 2. two output nodes, and 3. for four impedance legs each connected between a different pair of one input and one output and one output node, b. at least one of a said impedance legs including an element having an impedance which varies significantly as a function of the temperature of the element; c. means for applying electrical power to said input nodes, and d. a series-connected diode and light source directly connected between the output nodes of said bridge, said diode being in a conducting state when said bridge is unbalanced in one direction and in a nonconducting state when said bridge is unbalanced in the other direction, whereby said light source means emits light as a function of the degree of unbalance of said bridge in one direction and emits no light when the bridge is unbalanced in the other direction.

Claim 3

Dependent Claim 4 words

two output nodes, and

Claim 4

Dependent Claim 4 words

two output nodes, and

Claim 5

Dependent Claim 71 words

a capacitor adapted to be charged through said photosensitive resistor at a rate controlled by the amount of light irradiated onto said photosensitive resistor, b. output means for changing the temperature of said fluid; c. supply means for supplying energy for operating said output means; and d. control means responsive to the charge on said capacitor for controlling the rate of energy transfer from said supply means to said output means.

Claim 6

Dependent Claim 71 words

a capacitor adapted to be charged through said photosensitive resistor at a rate controlled by the amount of light irradiated onto said photosensitive resistor, b. output means for changing the temperature of said fluid; c. supply means for supplying energy for operating said output means; and d. control means responsive to the charge on said capacitor for controlling the rate of energy transfer from said supply means to said output means.

Claim 7

Dependent Claim 13 words

A device according to claim 1 wherein said electrical power is AC power.

Claim 8

Dependent Claim 4 words

two output nodes, and

Claim 9

Dependent Claim 4 words

two output nodes, and

Claim 10

Dependent Claim 57 words

and an additional capacitor adapted to be Charged through said additional photosensitive resistor at a rate controlled by the amount of light irradiated onto said additional photosensitive resistor, and c. an additional control means responsive to the charge on said capacitor for controlling the rate of energy transfer from said additional supply means to said output means.

Claim 11

Dependent Claim 57 words

and an additional capacitor adapted to be Charged through said additional photosensitive resistor at a rate controlled by the amount of light irradiated onto said additional photosensitive resistor, and c. an additional control means responsive to the charge on said capacitor for controlling the rate of energy transfer from said additional supply means to said output means.

Claim 12

Dependent Claim 84 words

means connected between said supply means and said output means for receiving each half-cycle of said AC voltage, for blocking passage of said AC current from the beginning of said half-cycle until the occurrence of said output pulse, and for passing said AC current from the occurrence of said output pulse until the end of said half-cycle, whereby the amount of energy reaching said output means varies as a function of the relative phase difference between said pulse and said beginning of said half-cycle.

Claim 13

Dependent Claim 84 words

means connected between said supply means and said output means for receiving each half-cycle of said AC voltage, for blocking passage of said AC current from the beginning of said half-cycle until the occurrence of said output pulse, and for passing said AC current from the occurrence of said output pulse until the end of said half-cycle, whereby the amount of energy reaching said output means varies as a function of the relative phase difference between said pulse and said beginning of said half-cycle.

Claim 14

Dependent Claim 102 words

four impedance legs, each connected between a different pair of one input and one output node, b. at least one of said impedance legs including an element having an impedance which varies as a function of the temperature of the element; c. means for applying electrical power to said input nodes; d. a series-connected diode and variable resistance means directly connected across said output nodes; e. a transistor amplifier including a control conductor and at least one signal conductor, said control conductor connected to an output terminal of said variable resistance means; and f. a light source connected to said signal conductor.

Claim 15

Dependent Claim 102 words

four impedance legs, each connected between a different pair of one input and one output node, b. at least one of said impedance legs including an element having an impedance which varies as a function of the temperature of the element; c. means for applying electrical power to said input nodes; d. a series-connected diode and variable resistance means directly connected across said output nodes; e. a transistor amplifier including a control conductor and at least one signal conductor, said control conductor connected to an output terminal of said variable resistance means; and f. a light source connected to said signal conductor.

Claim 16

Dependent Claim 137 words

for four impedance legs each connected between a different pair of one input and one output and one output node, b. at least one of a said impedance legs including an element having an impedance which varies significantly as a function of the temperature of the element; c. means for applying electrical power to said input nodes, and d. a series-connected diode and light source directly connected between the output nodes of said bridge, said diode being in a conducting state when said bridge is unbalanced in one direction and in a nonconducting state when said bridge is unbalanced in the other direction, whereby said light source means emits light as a function of the degree of unbalance of said bridge in one direction and emits no light when the bridge is unbalanced in the other direction.

Claim 17

Dependent Claim 137 words

for four impedance legs each connected between a different pair of one input and one output and one output node, b. at least one of a said impedance legs including an element having an impedance which varies significantly as a function of the temperature of the element; c. means for applying electrical power to said input nodes, and d. a series-connected diode and light source directly connected between the output nodes of said bridge, said diode being in a conducting state when said bridge is unbalanced in one direction and in a nonconducting state when said bridge is unbalanced in the other direction, whereby said light source means emits light as a function of the degree of unbalance of said bridge in one direction and emits no light when the bridge is unbalanced in the other direction.

Claim 18

Dependent Claim 29 words

A temperature control system including a temperature measuring device according to claim 1 for measuring the temperature of a fluid and further comprising: a. and RC circuit further comprising;

Claim 19

Dependent Claim 40 words

A temperature control system according to claim 3 wherein: a. said output means comprises an AC electrically operated heater element; b. said supply means comprises a source of a AC voltage and AC current; and c. said control means comprises:

Claim 20

Dependent Claim 35 words

A temperature control system according to claim 4 further comprising: a. an additional supply means for supplying a different phase of AC voltage and current to said output means; b. and additional RC circuit comprising;

Claim 21

Dependent Claim 10 words

A temperature measuring device comprising: a. a wheatstone bridge comprising;

Claim 22

Dependent Claim 10 words

A temperature measuring device comprising: a. a wheatstone bridge comprising;

Claim 23

Dependent Claim 20 words

A device as in claim 6 further including, a bias means coupled to said light source for prewarming said lamp.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1974-01-25	1974-07-27	1975-01-26	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1978-01-25	1978-07-27	1979-01-26	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1982-01-25	1982-07-27	1983-01-26	$7700.00	Window Closed / Lapsed

Temperature control system using a nonreentrant temperature-sensitive bridge transducer

Abstract

Inventors

Bibliographic Details

Claims Analysis

References Cited (Backward Citations)

USPTO Annuity & Maintenance Windows

Assigned Categories & Tags

Assign Category Tag