Patent US3176759A successfully refreshed from Google Patents.
US3176759A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air conditioning systems
Assignee: Individual
•
Filing: 1960-06-03
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Granted: 1965-04-06
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Expires: 1980-06-03
Abstract
No abstract record available.
Inventors
- 👤 Elwood A Windham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:51
CPC Classifications
F; F24; F24F; F24F3/00; F24F3/06; F24F3/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
IN AN AIR CONDITIONING SYSTEM HAVING A PLURALITY OF HEAT EXCHANGER FOR SEPARATE HETING AND COOLING OF SPACES AND WHEREIN EXHAUST LIQUID FROM THE HEAT EXCHANGERS IS RECEIVED BY A COMMON RETURN CONDUIT, A LIQUID VOLUME CONTROL COMPRISING, IN COMBINATION, A HOT LIQUID SUPPLY CONDUIT HAVING VALVE MEANS FOR CONTROLLING LIQUID FLOW THERETHROUGH, A COLD LIQUID SUPPLY CONDUIT HAVING VALVE MEANS FOR CONTROLLING LIQUID FLOW THERETHROUGH, BRANCH CONDUITS HAVING SELECTOR VALVE MEANS FROM SAID SUPPLY CONDUITS TO EACH HEAT EXCHANGER, SAID SUPPLY CONDUITS BEING DIMINISHED IN SIZE IN THE DIRECTION OF LIQUID FLOW, A RETURN CONDUIT CONNECTED TO RECEIVE EXHAUST LIQUID FROM EACH EXCHANGER, SAID RETURN CONDUIT HAVING AN INCREASE IN SIZE IN THE DIRECTION OF LIQUID FLOW, AND MEANS FOR CONTROLLING PRESSURE DIFFERENTIAL BETWEEN THE HOT LIQUID
Claim 2
Dependent Claim
128 words
IN AN AIR CONDITIONING SYSTEM HAVING A PLURALITY OF HEAT EXCHANGER FOR SEPARATE HETING AND COOLING OF SPACES AND WHEREIN EXHAUST LIQUID FROM THE HEAT EXCHANGERS IS RECEIVED BY A COMMON RETURN CONDUIT, A LIQUID VOLUME CONTROL COMPRISING, IN COMBINATION, A HOT LIQUID SUPPLY CONDUIT HAVING VALVE MEANS FOR CONTROLLING LIQUID FLOW THERETHROUGH, A COLD LIQUID SUPPLY CONDUIT HAVING VALVE MEANS FOR CONTROLLING LIQUID FLOW THERETHROUGH, BRANCH CONDUITS HAVING SELECTOR VALVE MEANS FROM SAID SUPPLY CONDUITS TO EACH HEAT EXCHANGER, SAID SUPPLY CONDUITS BEING DIMINISHED IN SIZE IN THE DIRECTION OF LIQUID FLOW, A RETURN CONDUIT CONNECTED TO RECEIVE EXHAUST LIQUID FROM EACH EXCHANGER, SAID RETURN CONDUIT HAVING AN INCREASE IN SIZE IN THE DIRECTION OF LIQUID FLOW, AND MEANS FOR CONTROLLING PRESSURE DIFFERENTIAL BETWEEN THE HOT LIQUID
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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) | 1968-04-05 | 1968-10-05 | 1969-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-05 | 1972-10-05 | 1973-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-05 | 1976-10-05 | 1977-04-06 | $7700.00 | Window Closed / Lapsed |