US3621673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air-conditioning system with combined chiller and accumulator
Assignee: Trane US Inc
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Filing: 1969-12-08
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Granted: 1971-11-23
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Expires: 1989-12-08
Abstract
Abstract AN OUTDOOR HYDRONIC HEATING-COOLING UNIT OROVIDES HOT ABD CHILLED PIQUID TO AN INDOOR FAN COIL UNIT. THE OUTDOOR UNIT HAS A COMPRESSION CYCLKE REFRIGERATION SYSTEM FOR COOLING A LIQUID HEAT EXCHANGE FLUID. THE HEAT EXCHANGE LIQUID IS COOLED BY PASSING IT THROUGH A FINNED SPIRAL TUBE DISPOSED WITHIN THE REFRIGERATION SYSTEM SUCTION LINE ACCUMMULATOR. THE OUTDOOR UNIT ALSO INCLUDES A LIQUID HEATER WITH GAS BURNER. A SINGLE PUMP IS USED TO CIRCULATE HEAT EXCHANGE LIQUID BETWEEN THE INDOOR FAN COIL AND THE OUTDOOR HEATING AND COOLING UNIT. THE LIQUID HEATER IS ARRANGED ABOVE THE CHILLER-ACCUMULATOR WITHIN A SINGLE CLOUSER.
Inventors
- 👤 Harry D Foust
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:58
CPC Classifications
F; F25; F25B; F25B43/00; F25B43/006; F25B40/00; F25D; F25D31/00; F25D31/005; F25B2339/00; F25B2339/02; F25B2339/024; F25B2339/0242; F25B2400/00; F25B2400/05; F25B2400/051
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |