US3839877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refrigeration systems with visual indicators
Assignee: Ardco Inc
•
Filing: 1973-06-25
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Granted: 1974-10-08
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Expires: 1993-06-25
Abstract
Abstract A refrigeration system which includes a visual indicator employing lights where one light turns on when the thermostat calls for cooling and second and subsequent lights turn on when compressors controlled by the thermostat start operation and a logical electro-mechanical method for examining the inputs to the lights and deciding whether alarm action should be taken.
Inventors
- 👤 D Kramer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:34
CPC Classifications
F; F25; F25B; F25B49/00; F25B49/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
70 words
An improved refrigerating system for cooling a medium comprising conduit-connected motor-driven compressor, having energized and de-energized conditions; condenser; liquid valve having energized and de-energized conditions; expansion device; and evaporator; a first control means for energizing and deenergizing the motor; a second control means for energizing and de-energizing the valve; wherein the improvement comprises means for sensing and means for continuously indicating the relative conditions of the motor and the valve.
Claim 2
Dependent Claim
70 words
An improved refrigerating system for cooling a medium comprising conduit-connected motor-driven compressor, having energized and de-energized conditions; condenser; liquid valve having energized and de-energized conditions; expansion device; and evaporator; a first control means for energizing and deenergizing the motor; a second control means for energizing and de-energizing the valve; wherein the improvement comprises means for sensing and means for continuously indicating the relative conditions of the motor and the valve.
Claim 3
Dependent Claim
14 words
A refrigerating system as in claim 1 where the means for sensing are relays.
Claim 4
Dependent Claim
12 words
lighting the second light in response to one condition of the coil.
Claim 5
Dependent Claim
12 words
lighting the second light in response to one condition of the coil.
Claim 6
Dependent Claim
14 words
A refrigerating system as in claim 1 where the means for sensing are transformers.
Claim 7
Dependent Claim
14 words
A refrigerating system as in claim 3 where the means for indicating are lights.
Claim 8
Dependent Claim
37 words
A refrigerating system as in claim 1 having a first light connected to light when the motor is in its energized condition, and a second light connected to light when the valve in in its energized condition.
Claim 9
Dependent Claim
40 words
A refrigerating system as in claim 1 where the first control means is a pressure switch connected to the low pressure side of the system and the second control means is a thermostat sensing the temperature of the cooled medium.
Claim 10
Independent Claim
108 words
A method for monitoring the condition of a refrigeration system where the system comprises: a motor, having energized and de-energized conditions; a first controller connected to the motor for controlling the condition of the motor; a coil, having energized and de-energized conditions; a second controller connected to the coil for controlling the condition of the coil; a first light and a second light, and conduit-connected compressor, connected to and driven by the motor; condenser; valve on which the coil is mounted for opening and closing it in response to the energization or de-energization of the coil; expansion device; and evaporator where the method comprises the steps of -
Claim 11
Independent Claim
108 words
A method for monitoring the condition of a refrigeration system where the system comprises: a motor, having energized and de-energized conditions; a first controller connected to the motor for controlling the condition of the motor; a coil, having energized and de-energized conditions; a second controller connected to the coil for controlling the condition of the coil; a first light and a second light, and conduit-connected compressor, connected to and driven by the motor; condenser; valve on which the coil is mounted for opening and closing it in response to the energization or de-energization of the coil; expansion device; and evaporator where the method comprises the steps of -
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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) | 1977-10-07 | 1978-04-08 | 1978-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-07 | 1982-04-08 | 1982-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-07 | 1986-04-08 | 1986-10-08 | $7700.00 | Window Closed / Lapsed |