US3090332A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas recirculation duct
Assignee: Combustion Engineering Inc
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Filing: 1960-12-29
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Granted: 1963-05-21
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Expires: 1980-12-29
Abstract
No abstract record available.
Inventors
- 👤 Henry E Burbach
- 👤 Otto T Hipp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:41
CPC Classifications
F; F22; F22G; F22G5/00; F22G5/06; F22G5/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
218 words
A STEAM GENERATING UNIT COMPRISING A FURNACE, FUEL AND AIR INLETS FOR SAID FURNACE, AN OUTLET LEADING FROM THE UPPER PORTION OF SAID FURNACE THROUGH WHICH THE HOT COMBUSTION GASES PASS, VERTICALL WALL MEANS FORMING A GAS PASS CONTAINING HEAT EXCHANGE MEANS, SAID GAS PASS BEING CONNECTED TO SAID FURNACE OUTLET SUCH THAT THE GASES PASS DOWNWARDLY THERETHROUGH, A DUCT IN COMMUNICATION AT ONE END WITH THE GAS PASS DOWNSTREAM OF SAID HEAT EXCHANGE MEANS, AND IN COMMUNICTION AT ITS OTHER END WITH SAID FURNACE, A FAN IN SAID DUCT, A PORTION OF SAID DUCT CONTAINED WITHIN SAID GAS PASS, SAID PORTION OF SAID DUCT EXTENDING ACROSS THE CENTER PORTION OF THE GAS PASS, A PLURALITY OF OPENINGS IN SAID DUCT BEING EVENLY SPACED ACROSS THE WIDTH OF THE GAS PASS THROUGH WHICH GASES ARE ALLOWED TO FLOW FROM THE GAS PASS INTO SAID DUCT, SAID OPENINGS BEING POSITIONED ON THE UNDERSIDE OF SAID DUCT, SUCH THAT THE GASES FLOWING IN THE GAS PASS MUST MAKE A 180* TURN TO ENTER SAID OPENINGS, SAID OPENINGS PROGRESSIVELY DECREASING IN SIZE, THE SMALLEST OPENING BEING LOCATED THE CLOSEST TO THE FAN, SO THERE IS NO IMBALANCE OF FLOW OF GASES THROUGH THE PORTION OF THE GAS PASS CONTAINING SAID HEAT EXCHANGE MEANS DUE TO THE SUCTION EFFECT OF SAID FAN.
Claim 2
Dependent Claim
218 words
A STEAM GENERATING UNIT COMPRISING A FURNACE, FUEL AND AIR INLETS FOR SAID FURNACE, AN OUTLET LEADING FROM THE UPPER PORTION OF SAID FURNACE THROUGH WHICH THE HOT COMBUSTION GASES PASS, VERTICALL WALL MEANS FORMING A GAS PASS CONTAINING HEAT EXCHANGE MEANS, SAID GAS PASS BEING CONNECTED TO SAID FURNACE OUTLET SUCH THAT THE GASES PASS DOWNWARDLY THERETHROUGH, A DUCT IN COMMUNICATION AT ONE END WITH THE GAS PASS DOWNSTREAM OF SAID HEAT EXCHANGE MEANS, AND IN COMMUNICTION AT ITS OTHER END WITH SAID FURNACE, A FAN IN SAID DUCT, A PORTION OF SAID DUCT CONTAINED WITHIN SAID GAS PASS, SAID PORTION OF SAID DUCT EXTENDING ACROSS THE CENTER PORTION OF THE GAS PASS, A PLURALITY OF OPENINGS IN SAID DUCT BEING EVENLY SPACED ACROSS THE WIDTH OF THE GAS PASS THROUGH WHICH GASES ARE ALLOWED TO FLOW FROM THE GAS PASS INTO SAID DUCT, SAID OPENINGS BEING POSITIONED ON THE UNDERSIDE OF SAID DUCT, SUCH THAT THE GASES FLOWING IN THE GAS PASS MUST MAKE A 180* TURN TO ENTER SAID OPENINGS, SAID OPENINGS PROGRESSIVELY DECREASING IN SIZE, THE SMALLEST OPENING BEING LOCATED THE CLOSEST TO THE FAN, SO THERE IS NO IMBALANCE OF FLOW OF GASES THROUGH THE PORTION OF THE GAS PASS CONTAINING SAID HEAT EXCHANGE MEANS DUE TO THE SUCTION EFFECT OF SAID FAN.
References Cited (Backward Citations)
GB744797A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-05-20 | 1966-11-19 | 1967-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-05-20 | 1970-11-19 | 1971-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-05-20 | 1974-11-19 | 1975-05-21 | $7700.00 | Window Closed / Lapsed |