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US3780263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal control apparatus
Assignee: Individual
•
Filing: 1972-05-10
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Granted: 1973-12-18
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Expires: 1992-05-10
Abstract
Abstract Thermal control apparatus for controlling the temperature of a photo-developing bath including electrically powered filaments disposed in the bath and energized by a control circuit responsive to the temperature of the bath. The control circuit includes a voltage divider connected across two leads connected to a conventional house outlet having the control point thereof connected to a four layer diode. The output signal from the diode is connected to gate the first of two opposite polarity silicon controlled rectifiers, with the second rectifier being capacitorconnected to gate at the end of the pulse of the first rectifier. The upper leg of the voltage divider includes a positive thermal coefficient resistor thermally coupled to the first rectifier and the lower leg includes a thermistor thermally responsive to the temperature of the bath.
Inventors
- 👤 R Kuzyk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:33
CPC Classifications
G; G03; G03D; G03D13/00; G03D13/006; G05; G05D; G05D23/00; G05D23/19; G05D23/1906; G05D23/1909; G05D23/20; G05D23/24
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
151 words
A thermal control system for controlling the temperature of a fluid in a container, comprising, in combination: container means adapted to receive the fluid; electrical heating means disposed within said container means for transferring heat to the fluid upon passing electrical current therethrough; and power supply means connected to said electrical heating means including resistive means responsive both to the temperature of the fluid and the internal temperature of said power supply means, gating means operatively connected for switching to said resistive means for conducting a series of continually decreasing pulses of electrical current to said heating means from said power supply means controlled by said gating means to provide a first pulse of a width functionally dependent on the temperature difference between a preselected temperature and the temperature of the fluid and the other consecutive pulses being further functionally dependent in width on the internal temperature of said gating means.
Claim 2
Dependent Claim
151 words
A thermal control system for controlling the temperature of a fluid in a container, comprising, in combination: container means adapted to receive the fluid; electrical heating means disposed within said container means for transferring heat to the fluid upon passing electrical current therethrough; and power supply means connected to said electrical heating means including resistive means responsive both to the temperature of the fluid and the internal temperature of said power supply means, gating means operatively connected for switching to said resistive means for conducting a series of continually decreasing pulses of electrical current to said heating means from said power supply means controlled by said gating means to provide a first pulse of a width functionally dependent on the temperature difference between a preselected temperature and the temperature of the fluid and the other consecutive pulses being further functionally dependent in width on the internal temperature of said gating means.
Claim 3
Dependent Claim
42 words
A temperature control system according to claim 1 further comprising: said electrical heating means including a plurality of resistive filaments connected to receive at respective one ends thereof said electrical current and connected at th other ends thereof to return said current.
Claim 4
Dependent Claim
157 words
A temperature control system according to claim 2, further comprising: said power supply means including a source of alternating electrical power, a voltage divider having a resistive upper leg temperature responsive by an increase in resistance with an increase in the temperature, a resistive lower leg including an adjustable potentiometer and a negative temperature coefficient thermistor disposed to sense the temperature of said container means, said upper leg being connected at one end thereof to one side of said power source and said lower leg connecting at the one end thereof to the other side of said power source, the respective other ends of said legs being connected in common, a four layer diode connected at the input terminal thereof to the connection between said upper and lower legs and rectifier means connected to receive the output signal from said diode and disposed to conduct the thermal output thereof to the upper leg of said voltage divider.
Claim 5
Dependent Claim
78 words
A thermal control system according to Claim 3, further comprising: said rectifier means including a first silicon controlled rectifier connected between the other side of said power source and the other ends of said filaments, a second silicon controlled rectifier connected in opposing polarity therewith, said first rectifier being connected at the gate terminal thereof to the output terminal of said diode, and said second rectifier being capacitor coupled at the gate terminal thereof with said first rectifier.
Claim 6
Dependent Claim
40 words
A thermal control system according to claim 3, further comprising: said voltage divider including a capacitor connected in seRies with the upper leg thereof and a Zener diode connected from said capacitor in parallel across said upper and lower legs.
Claim 7
Dependent Claim
77 words
A thermal control system according to claim 5 further comprising: said rectifier means including a first silicon controlled rectifier connected between the other side of said power source and the other ends of said filaments, a second silicon controlled rectifier connected in opposing polarity therewith, said first rectifier being connected at the gate terminal thereof to the output terminal of said diode, and said second rectifier being capacitor-coupled at the gate terminal thereof with said first rectifier.
Claim 8
Dependent Claim
144 words
A thermal control system for controlling the temperature of matter, comprising, in combination: electrical heating means adapted to be disposed for thermal contact with the matter for transferring heat thereto upon having electrical current passed therethrough; and power supply means connected to said electrical heating means including resistive means responsive both to the temperature of the fluid and the internal temperature of said power supply means, gating means operatively connected for switching to said resistive means for conducting a series of continually decreasing pulses of electrical current to said heating means from said power supply means controlled by said gating means to provide a first pulse of a width functionally dependent on the temperature difference between a preselected temperature and the temperature of the fluid and the other consecutive pulses being further functionally dependent in width on the internal temperature of said gating means.
Claim 9
Dependent Claim
144 words
A thermal control system for controlling the temperature of matter, comprising, in combination: electrical heating means adapted to be disposed for thermal contact with the matter for transferring heat thereto upon having electrical current passed therethrough; and power supply means connected to said electrical heating means including resistive means responsive both to the temperature of the fluid and the internal temperature of said power supply means, gating means operatively connected for switching to said resistive means for conducting a series of continually decreasing pulses of electrical current to said heating means from said power supply means controlled by said gating means to provide a first pulse of a width functionally dependent on the temperature difference between a preselected temperature and the temperature of the fluid and the other consecutive pulses being further functionally dependent in width on the internal temperature of said gating means.
Claim 10
Dependent Claim
88 words
A thermal control apparatus according th claim 7, further comprising: said power supply means including a source of alternating electrical power, first means connected to receive said electrical power and disposed to sense the temperature of the matter for passing selected pulses of said power to said heating means of a pulse width corresponding to the difference between a preselected temperature and and sensed temperature, and second means operatively connected to said first means for decreasing said pulses upon an increase in the temperature of said first means.
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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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |