US3303873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating and cooling system
Assignee: Trane US Inc
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Filing: 1965-03-29
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Granted: 1967-02-14
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Expires: 1985-03-29
Abstract
No abstract record available.
Inventors
- 👤 Clarence L Ringqulst
- 👤 John W Lorenz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:03
CPC Classifications
F; F24; F24F; F24F3/00; F24F3/06; F24F3/08; F24F11/00; F24F11/70; F24F11/80; F24F11/83; F24F11/84; F24F11/30; F24F2110/00; F24F2110/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
IN AN AIR CONDITIONING SYSTEM CONSISTING OF A PLURALITY OF ZONES TO BE CONDITIONED, A HEAT EXCHANGE UNIT IN EACH OF SAID ZONES, A HOT WATER PIPING CIRCUIT INCLUDING A WATER HEATER ARRANGED TO CIRCULATE HOT WATER TO AND FROM EACH OF SAID HEAT EXCHANGE UNITS AND A SEPARATE CHILLED WATER PIPING CIRCUIT INCLUDING A WATER CHILLER ARRANGED TO CIRCULATE CHILLED WATER TO AND FROM EACH OF SAID HEAT EXCHANGE UNITS; THE IMPROVEMENT COMPRISING MEANS PLACING SAID WATER HEATER IN FLUID COMMUNICATION WITH SAID CHILLED WATER PIPING CIRCUIT WHEREBY SAID LATTER CIRCUIT MAY BE UTILIZED TO CIRCULATE HOT WATER DURING PERIODS OF HIGH HEAT DEMAND.
Claim 2
Dependent Claim
105 words
IN AN AIR CONDITIONING SYSTEM CONSISTING OF A PLURALITY OF ZONES TO BE CONDITIONED, A HEAT EXCHANGE UNIT IN EACH OF SAID ZONES, A HOT WATER PIPING CIRCUIT INCLUDING A WATER HEATER ARRANGED TO CIRCULATE HOT WATER TO AND FROM EACH OF SAID HEAT EXCHANGE UNITS AND A SEPARATE CHILLED WATER PIPING CIRCUIT INCLUDING A WATER CHILLER ARRANGED TO CIRCULATE CHILLED WATER TO AND FROM EACH OF SAID HEAT EXCHANGE UNITS; THE IMPROVEMENT COMPRISING MEANS PLACING SAID WATER HEATER IN FLUID COMMUNICATION WITH SAID CHILLED WATER PIPING CIRCUIT WHEREBY SAID LATTER CIRCUIT MAY BE UTILIZED TO CIRCULATE HOT WATER DURING PERIODS OF HIGH HEAT DEMAND.
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) | 1970-02-13 | 1970-08-15 | 1971-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-13 | 1974-08-15 | 1975-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-13 | 1978-08-15 | 1979-02-14 | $7700.00 | Window Closed / Lapsed |