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US3686475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control circuit for a liquid vaporizing tool
Assignee: Motors Liquidation Co
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Filing: 1971-03-04
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Granted: 1972-08-22
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Expires: 1991-03-04
Abstract
Abstract A control circuit for controlling the temperature of a liquid vaporizing tool to a temperature required to vaporize the liquid. A low voltage is applied to heating elements on the tool to maintain the tool at the required temperature to vaporize the liquid during standby operation when there is no liquid being supplied to the tool. A high voltage is applied to the heating elements during operation of the tool, when liquid is being supplied thereto, so as to accommodate the increased heat input requirement caused by the vaporization of the liquid to maintain the tool at the vaporizing temperature. A thermal switch located on the tool opens or closes the respective voltage supply circuits to maintain the tool at the required vaporization temperature. In addition, to compensate for the thermal lag in the tool and to accommodate the sudden high heat demand caused by liquid vaporization when the liquid is initially supplied to the tool, the thermal switch is bypassed and the high voltage is applied to the heating elements for a specified time duration in anticipation of the thermal lag.
Inventors
- 👤 John E Mikkola
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:49
CPC Classifications
B; B05; B05B; B05B12/00; B05B7/00; B05B7/16; B05B7/1686; B05B7/22; B05B9/00; B05B9/002; G; G05; G05D; G05D23/00; G05D23/19; G05D23/1906; G05D23/1909; G05D23/275
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
339 words
A control apparatus for controlling the temperature of a liquid vaporizing tool in a liquid vaporizing system which includes the tool, liquid supply means for supplying liquid to the tool and a valve having open and closed positions for selectively allowing or preventing, respectively, the flow of the liquid to the tool, the control apparatus comprising heating elements mounted on the tool, the elements being responsive to voltage applied thereto for heating the tool; a thermal switch mounted on the tool, said switch having a first state when the temperature of the tool is below the temperature required to vaporize the liquid and a second state when the temperature of the tool is at or above said temperature; a first voltage supply having a pair of output terminals; a second voltage supply having a pair of output terminals, the voltage output of the second voltage supply being greater than the voltage output of the first voltage supply; first circuit means responsive to valve position and to the state of the thermal switch for connecting the pair of output terminals of the first voltage supply across the heating elements when the valve is in its closed position and the thermal switch is in its first state; second circuit means responsive to valve position and to the state of the thermal switch for connecting the pair of output terminals of the second voltage supply across the heating elements when the valve is in its open position and the thermal switch is in its first state, whereby the first voltage supply supplies a voltage to the heating elements to maintain the tool at the temperature required to vaporize the liquid when the valve is closed and the second voltage supply supplies a greater voltage to the heating elements to maintain the tool at said temperature when the valve is open, the voltage required to maintain the tool at said temperature being greater when the valve is open than when the valve is closed due to heat dissipation caused by the liquid vaporization.
Claim 2
Dependent Claim
339 words
A control apparatus for controlling the temperature of a liquid vaporizing tool in a liquid vaporizing system which includes the tool, liquid supply means for supplying liquid to the tool and a valve having open and closed positions for selectively allowing or preventing, respectively, the flow of the liquid to the tool, the control apparatus comprising heating elements mounted on the tool, the elements being responsive to voltage applied thereto for heating the tool; a thermal switch mounted on the tool, said switch having a first state when the temperature of the tool is below the temperature required to vaporize the liquid and a second state when the temperature of the tool is at or above said temperature; a first voltage supply having a pair of output terminals; a second voltage supply having a pair of output terminals, the voltage output of the second voltage supply being greater than the voltage output of the first voltage supply; first circuit means responsive to valve position and to the state of the thermal switch for connecting the pair of output terminals of the first voltage supply across the heating elements when the valve is in its closed position and the thermal switch is in its first state; second circuit means responsive to valve position and to the state of the thermal switch for connecting the pair of output terminals of the second voltage supply across the heating elements when the valve is in its open position and the thermal switch is in its first state, whereby the first voltage supply supplies a voltage to the heating elements to maintain the tool at the temperature required to vaporize the liquid when the valve is closed and the second voltage supply supplies a greater voltage to the heating elements to maintain the tool at said temperature when the valve is open, the voltage required to maintain the tool at said temperature being greater when the valve is open than when the valve is closed due to heat dissipation caused by the liquid vaporization.
Claim 3
Dependent Claim
331 words
A control apparatus for controlling the temperature of a liquid vaporizing tool in a liquid vaporizing system which includes the tool, liquid supply means for supplying liquid to the tool and a valve having open and closed positions for selectively allowing or preventing, respectively, the flow of the liquid to the tool, the control apparatus comprising heating elements mounted on the tool, the heating elements being responsive to voltage supplied thereto for heating the tool; a thermal switch mounted on the tool, said switch having a first state when the temperature of the tool is below the temperature required to vaporize the liquid and a second state when the temperature of the tool is at or above said temperature; a first voltage supply having a pair of output terminals; a second voltage supply having a pair of output teRminals, the voltage output of the second voltage supply being greater than the voltage output of the first voltage supply; first switch means operative when energized to connect the output terminals of the first voltage supply across the heating elements; second switch means operative when energized to connect the output terminals of the second voltage supply across the heating elements; first circuit means for energizing the first switch means when the thermal switch is in its first state and the valve is in its closed position, the tool being maintained at the temperature required to vaporize the liquid when the valve is closed by the voltage supplied to the heating elements from the first voltage supply; and second circuit means for energizing the second switch means when the thermal switch is in its first state and the valve is in its open position, the tool being maintained at the temperature required to vaporize the liquid when the valve is open by the increased voltage supplied to the heating elements from the second voltage supply, the increased voltage being required when the valve is open due to heat dissipation caused by the liquid vaporization.
Claim 4
Dependent Claim
331 words
A control apparatus for controlling the temperature of a liquid vaporizing tool in a liquid vaporizing system which includes the tool, liquid supply means for supplying liquid to the tool and a valve having open and closed positions for selectively allowing or preventing, respectively, the flow of the liquid to the tool, the control apparatus comprising heating elements mounted on the tool, the heating elements being responsive to voltage supplied thereto for heating the tool; a thermal switch mounted on the tool, said switch having a first state when the temperature of the tool is below the temperature required to vaporize the liquid and a second state when the temperature of the tool is at or above said temperature; a first voltage supply having a pair of output terminals; a second voltage supply having a pair of output teRminals, the voltage output of the second voltage supply being greater than the voltage output of the first voltage supply; first switch means operative when energized to connect the output terminals of the first voltage supply across the heating elements; second switch means operative when energized to connect the output terminals of the second voltage supply across the heating elements; first circuit means for energizing the first switch means when the thermal switch is in its first state and the valve is in its closed position, the tool being maintained at the temperature required to vaporize the liquid when the valve is closed by the voltage supplied to the heating elements from the first voltage supply; and second circuit means for energizing the second switch means when the thermal switch is in its first state and the valve is in its open position, the tool being maintained at the temperature required to vaporize the liquid when the valve is open by the increased voltage supplied to the heating elements from the second voltage supply, the increased voltage being required when the valve is open due to heat dissipation caused by the liquid vaporization.
Claim 5
Dependent Claim
431 words
A control apparatus for controlling the temperature of a liquid vaporizing tool in a liquid vaporizing system which includes the tool, liquid supply means for supplying liquid to the tool and a valve having open and closed positions for selectively allowing or preventing, respectively, a flow of the liquid to the tool, the control apparatus comprising heating elements mounted on the tool, the heating elements being responsive to voltage supplied thereto for heating the tool; a thermal switch mounted on the tool, said switch having a first state when the temperature of the tool is below the temperature required to vaporize the liquid and a second state when the temperature of the tool is at or above said temperature; a first voltage supply having a pair of output terminals; a second voltage supply having a pair of output terminals, the voltage output of the second voltage supply being greater than the voltage output of the first voltage supply; first switch means operative when energized to connect the output terminals of the first voltage supply across the heating elements; second switch means operative when energized to connect the output terminals of the second voltage supply across the heating elements; first circuit means including the thermal switch for energizing the first switch means when the valve is in its closed position and the thermal switch is in its first state, the tool being maintained at the required temperature to vaporize the liquid when the valve is closed by the voltage supplied to the heating elements from the first voltage supply; second circuit means including the thermal switch for energizing the second switch means when the valve is in its open position and the thermal switch is in its first state, the tool being maintained at the temperature required to vaporize the liquid when the valve is open by the increased voltage supplied to the heating elements from the second voltage supply, the increased voltage being required when the valve is open due to heat dissipation caused by the liquid vaporization; and means for energizing the second switch means independent of the state of the thermal switch for a predetermined time period after the valve is shifted from its closed position to its open position so as to supply increased voltage from the second voltage supply to the heating elements for the predetermined time period independent of the thermal switch to compensate for the thermal lag in the tool following the sudden increased heat requirement to maintain the tool at the temperature required to vaporize the liquid caused by the vaporization of the liquid.
Claim 6
Dependent Claim
431 words
A control apparatus for controlling the temperature of a liquid vaporizing tool in a liquid vaporizing system which includes the tool, liquid supply means for supplying liquid to the tool and a valve having open and closed positions for selectively allowing or preventing, respectively, a flow of the liquid to the tool, the control apparatus comprising heating elements mounted on the tool, the heating elements being responsive to voltage supplied thereto for heating the tool; a thermal switch mounted on the tool, said switch having a first state when the temperature of the tool is below the temperature required to vaporize the liquid and a second state when the temperature of the tool is at or above said temperature; a first voltage supply having a pair of output terminals; a second voltage supply having a pair of output terminals, the voltage output of the second voltage supply being greater than the voltage output of the first voltage supply; first switch means operative when energized to connect the output terminals of the first voltage supply across the heating elements; second switch means operative when energized to connect the output terminals of the second voltage supply across the heating elements; first circuit means including the thermal switch for energizing the first switch means when the valve is in its closed position and the thermal switch is in its first state, the tool being maintained at the required temperature to vaporize the liquid when the valve is closed by the voltage supplied to the heating elements from the first voltage supply; second circuit means including the thermal switch for energizing the second switch means when the valve is in its open position and the thermal switch is in its first state, the tool being maintained at the temperature required to vaporize the liquid when the valve is open by the increased voltage supplied to the heating elements from the second voltage supply, the increased voltage being required when the valve is open due to heat dissipation caused by the liquid vaporization; and means for energizing the second switch means independent of the state of the thermal switch for a predetermined time period after the valve is shifted from its closed position to its open position so as to supply increased voltage from the second voltage supply to the heating elements for the predetermined time period independent of the thermal switch to compensate for the thermal lag in the tool following the sudden increased heat requirement to maintain the tool at the temperature required to vaporize the liquid caused by the vaporization of the liquid.
Claim 7
Dependent Claim
280 words
A control apparatus for controlling the temperature of a liquid vaporizing tool in a liquid vaporizing system which includes the tool, liquid supply means for supplying liquid to the tool and a valve having open and closed positionS for selectively allowing or preventing, respectively, a flow of the liquid to the tool, the control apparatus comprising heating elements mounted on the tool, the heating elements being responsive to voltage supplied thereto for heating the tool; a thermal switch mounted on the tool, said switch having a first state when the temperature of the tool is below the temperature required to vaporize the liquid and a second state when the temperature of the tool is at or above said temperature; a voltage supply having a pair of output terminals; circuit means including the thermal switch for connecting the output terminals of the voltage supply across the heating elements when the thermal switch is in its first state, the tool being maintained at the required temperature to vaporize the liquid by the voltage applied to the heating elements from the voltage supply; and means for connecting the output terminals of the voltage supply across the heating elements independent of the state of the thermal switch for a predetermined time period after the valve is shifted from its closed position to its open position so as to apply the output of the voltage supply continuously to the heating elements for the predetermined time period independent of the thermal switch to compensate for the thermal lag in the tool following the sudden increased heat requirement to maintain the tool at the temperature required to vaporize the liquid caused by the vaporization of the liquid.
Claim 8
Dependent Claim
280 words
A control apparatus for controlling the temperature of a liquid vaporizing tool in a liquid vaporizing system which includes the tool, liquid supply means for supplying liquid to the tool and a valve having open and closed positionS for selectively allowing or preventing, respectively, a flow of the liquid to the tool, the control apparatus comprising heating elements mounted on the tool, the heating elements being responsive to voltage supplied thereto for heating the tool; a thermal switch mounted on the tool, said switch having a first state when the temperature of the tool is below the temperature required to vaporize the liquid and a second state when the temperature of the tool is at or above said temperature; a voltage supply having a pair of output terminals; circuit means including the thermal switch for connecting the output terminals of the voltage supply across the heating elements when the thermal switch is in its first state, the tool being maintained at the required temperature to vaporize the liquid by the voltage applied to the heating elements from the voltage supply; and means for connecting the output terminals of the voltage supply across the heating elements independent of the state of the thermal switch for a predetermined time period after the valve is shifted from its closed position to its open position so as to apply the output of the voltage supply continuously to the heating elements for the predetermined time period independent of the thermal switch to compensate for the thermal lag in the tool following the sudden increased heat requirement to maintain the tool at the temperature required to vaporize the liquid caused by the vaporization of the liquid.
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) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |