Patent US3137341A successfully refreshed from Google Patents.
US3137341A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger temperature control system
Assignee: Askania Regulator Co
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Filing: 1962-08-20
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Granted: 1964-06-16
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Expires: 1982-08-20
Abstract
No abstract record available.
Inventors
- 👤 Lawrence E Ruffing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:30
CPC Classifications
F; F28; F28F; F28F27/00; G; G05; G05D; G05D23/00; G05D23/185
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
207 words
A HEAT EXCHANGER TEMPERATURE CONTROL SYSTEM COMPRISING, (A) A HEAT EXCHANGER INCLUDING AN OUTFLOW PASSAGE ADAPTED TO PRE-HEAT COMBUSTION AIR BEING SUPPLIED TO A FURNACE INSTALLATION IN ACCORDANCE WITH THE HOT WASTE AIR CONVEYED FROM SAID FURNACE INSTALLATION, SAID FURNACE INSTALLATION INCLUDING A FUEL/AIR RATIO CONTROLLER WITH THE AMOUNT OF FUEL BEING APPLIED THERETO BEING INVERSELY PROPORTIONAL TO THE FURNACE TEMPERATURE; (B) AN INFLOW CONTROL VALVE RESPONSIVE TO SAID FUEL/AIR CONTROLLER FOR REGULATING THE VOLUME OF COMBUSTION AIR DELIVERED TO SAID FURNACE HEAT EXCHANGER; (C) A BY-PASS VALVE POSITIONED IN PARALLEL WITH SAID INFLOW CONTROL VALVE TO DIVERT A CONTROLLED AMOUNT OF AIR AROUND SAID INFLOW CONTROL VALVE; (D) A BLEED-OFF VALVE CONNECTED TO THE OUTFLOW PASSAGE FROM SAID HEAT EXCHANGER TO DIVERT CONTROLLED AMOUNTS OF PRE-HEATED AIR TO ATMOSPHERE; (E) MEANS RESPONSIVE TO HEAT RISE IN SAID HEAT EXCHANGER TO INCREASE THE AMOUNT OF PRE-HEATED AIR DIVERTED TO ATMOSPHERE; AND (F) MEANS RESPONSIVE TO THE VOLUME OF PRE-HEATED AIR DIVERTED TO ATMOSPHERE TO CONTROL THE OPERATION OF SAID BY-PASS VALVE, WHEREBY THE BY-PASS AND BLEEDOF VALVES IN COMBINATION OPEATE TO MAINTAIN THE HEAT TRANSFER SURFACES WITHIN SAID HEAT EXCHANGER WITHIN SAFE LIMITS WHILE THE REGULATED VOLUME OF COMBUSTION AIR THROUGH SAID INFLOW CONTROL VALVE IS UNEFFECTED.
Claim 2
Dependent Claim
207 words
A HEAT EXCHANGER TEMPERATURE CONTROL SYSTEM COMPRISING, (A) A HEAT EXCHANGER INCLUDING AN OUTFLOW PASSAGE ADAPTED TO PRE-HEAT COMBUSTION AIR BEING SUPPLIED TO A FURNACE INSTALLATION IN ACCORDANCE WITH THE HOT WASTE AIR CONVEYED FROM SAID FURNACE INSTALLATION, SAID FURNACE INSTALLATION INCLUDING A FUEL/AIR RATIO CONTROLLER WITH THE AMOUNT OF FUEL BEING APPLIED THERETO BEING INVERSELY PROPORTIONAL TO THE FURNACE TEMPERATURE; (B) AN INFLOW CONTROL VALVE RESPONSIVE TO SAID FUEL/AIR CONTROLLER FOR REGULATING THE VOLUME OF COMBUSTION AIR DELIVERED TO SAID FURNACE HEAT EXCHANGER; (C) A BY-PASS VALVE POSITIONED IN PARALLEL WITH SAID INFLOW CONTROL VALVE TO DIVERT A CONTROLLED AMOUNT OF AIR AROUND SAID INFLOW CONTROL VALVE; (D) A BLEED-OFF VALVE CONNECTED TO THE OUTFLOW PASSAGE FROM SAID HEAT EXCHANGER TO DIVERT CONTROLLED AMOUNTS OF PRE-HEATED AIR TO ATMOSPHERE; (E) MEANS RESPONSIVE TO HEAT RISE IN SAID HEAT EXCHANGER TO INCREASE THE AMOUNT OF PRE-HEATED AIR DIVERTED TO ATMOSPHERE; AND (F) MEANS RESPONSIVE TO THE VOLUME OF PRE-HEATED AIR DIVERTED TO ATMOSPHERE TO CONTROL THE OPERATION OF SAID BY-PASS VALVE, WHEREBY THE BY-PASS AND BLEEDOF VALVES IN COMBINATION OPEATE TO MAINTAIN THE HEAT TRANSFER SURFACES WITHIN SAID HEAT EXCHANGER WITHIN SAFE LIMITS WHILE THE REGULATED VOLUME OF COMBUSTION AIR THROUGH SAID INFLOW CONTROL VALVE IS UNEFFECTED.
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) | 1967-06-16 | 1967-12-16 | 1968-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-16 | 1971-12-16 | 1972-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-16 | 1975-12-16 | 1976-06-16 | $7700.00 | Window Closed / Lapsed |