Patent US3256929A successfully refreshed from Google Patents.
US3256929A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piping system providing instantaneous changeover from heating to cooling and vice versa
Assignee: TDK Micronas GmbH
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Filing: 1964-05-08
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Granted: 1966-06-21
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Expires: 1984-05-08
Abstract
No abstract record available.
Inventors
- 👤 Gilbert F Carlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:22
CPC Classifications
F; F24; F24F; F24F3/00; F24F3/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
IN A SYSTEM HAVING A PAIR OF LIQUID CIRCUITS, EACH OF WHICH CIRCUITS INCLUDES MEANS FOR CHANGING THE TEMPERATURE OF THE LIQUID THEREIN, AT LEAST ONE HEAT EXCHANGE DEVICE ADAPTED TO BE CONNECTED SELECTIVELY IN SAID CIRCUITS, MEANS FOR CONNECTING SAID HEAT EXCHANGE DEVICE SELECTIVELY TO SAID CIRCUITS FOR FLOW THERETHROUGH, SAID MEANS COMPRISING A PAIR OF SUPPLY CONNECTIONS TO SAID HEAT EXCHANGE DEVICE CONNECTED IN PARALLEL WITH EACH OTHER AND COMPRISING A FIRST SUPPLY CONNECTION TO ONE OF SAID LIQUID CIRCUITS AND HAVING A FLOW RESPONSIVE VALVE CONNECTED THEREIN ADAPTED TO PASS LIQUID FROM SAID ONE CIRCUIT TO SAID HEAT EXCHANGE DEVICE, A SECOND SUPPLY CONNECTION TO THE OTHER OF SAID LIQUID CIRCUITS AND HAVING A CONDITION RESPONSIVE VALVE CONNECTED THEREIN, MEANS FOR ACTUATING SAID CONDITION RESPONSIVE VALVE IN ACCORDANCE WITH A DEMAND CONDITION AT SAID HEAT EXCHANGE DEVICE, A PAIR OF RE-
Claim 2
Dependent Claim
144 words
IN A SYSTEM HAVING A PAIR OF LIQUID CIRCUITS, EACH OF WHICH CIRCUITS INCLUDES MEANS FOR CHANGING THE TEMPERATURE OF THE LIQUID THEREIN, AT LEAST ONE HEAT EXCHANGE DEVICE ADAPTED TO BE CONNECTED SELECTIVELY IN SAID CIRCUITS, MEANS FOR CONNECTING SAID HEAT EXCHANGE DEVICE SELECTIVELY TO SAID CIRCUITS FOR FLOW THERETHROUGH, SAID MEANS COMPRISING A PAIR OF SUPPLY CONNECTIONS TO SAID HEAT EXCHANGE DEVICE CONNECTED IN PARALLEL WITH EACH OTHER AND COMPRISING A FIRST SUPPLY CONNECTION TO ONE OF SAID LIQUID CIRCUITS AND HAVING A FLOW RESPONSIVE VALVE CONNECTED THEREIN ADAPTED TO PASS LIQUID FROM SAID ONE CIRCUIT TO SAID HEAT EXCHANGE DEVICE, A SECOND SUPPLY CONNECTION TO THE OTHER OF SAID LIQUID CIRCUITS AND HAVING A CONDITION RESPONSIVE VALVE CONNECTED THEREIN, MEANS FOR ACTUATING SAID CONDITION RESPONSIVE VALVE IN ACCORDANCE WITH A DEMAND CONDITION AT SAID HEAT EXCHANGE DEVICE, A PAIR OF RE-
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) | 1969-06-20 | 1969-12-20 | 1970-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-20 | 1973-12-20 | 1974-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-20 | 1977-12-20 | 1978-06-21 | $7700.00 | Window Closed / Lapsed |