Patent US3555843A successfully refreshed from Google Patents.
US3555843A
Expired / Lapsed
US
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Water chilling unit control
Assignee: Robertshaw US Holding Corp
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Filing: 1969-07-23
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Granted: 1971-01-19
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Expires: 1989-07-23
Abstract
Abstract AN ELECTRIC MOTOR POWERED COMPRESSOR-CONDENSER-EVAPORATOR TYPE WATER COOLER REFRIGERATING SYSTEM IS CONTROLLED BY A SWITCH AND VALVE ACTUATED BY A POWER ELEMENT RESPONSIVE TO WATER TEMPERATURE ADJACENT THE EVAPORATOR, THE VALVE BYPASSING PROGRESSIVELY LARGER PROPORTIONS OF REFRIGERANT AROUND THE EVAPORATOR DURING A COOLING CYCLE TO GRADUALLY REDUCE THE COOLING EFFICIENCY OF THE EVAPORATOR. THIS CONTROL PREVENTS SHORT CYCLING OF THE SYSTEM AND EFFECTS RAPID UNLOADING OF HEAD PRESSURE.
Inventors
- 👤 Russell E Cook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:37
CPC Classifications
F; F25; F25D; F25D31/00; F25D31/002; F25B; F25B41/00; F25B41/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |