Patent US3146337A successfully refreshed from Google Patents.
US3146337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resistance-heated electric furnace
Assignee: Individual
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Filing: 1961-10-16
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Granted: 1964-08-25
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Expires: 1981-10-16
Abstract
No abstract record available.
Inventors
- 👤 Jeru Henri Jean Marie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:48
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/62; A; A21; A21B; A21B1/00; A21B1/02; A21B1/06; A21B1/22; F; F27; F27D; F27D11/00; F27D11/02; H05B3/66
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
AN ELECTRIC RESISTANCE FURNACE WITH CIRCULATION OF HOT AIR BY RECYCLING, COMPRISING AN OUTER FRAMEWORK, A HEATING CHAMBER SUBSTANTIALLY CONSTITUTED BY TRANSVERSELY EXTENDING THIN FLAT METAL STRIPS WHICH FORM ELECTRIC HEATING RESISTANCES, SAID STRIPS EXTENDING OVER THE TOP AND AT LEAST A PORTION OF THE SIDES OF SAID HEATING CHAMBER AND BEING ARRANGED IN SUCCESSION ALONG THE LENGTH OF THE FURNACE WITH SPACES BETWEEN THEM, SUSPENSION MEANS SUPPORTING SAID STRIPS AND FIXED TO SAID FRAMEWORK, A LINING OF THERMAL INSULATION CARRIED DIRECTLY ON AND SUPPORTED BY SAID STRIPS AND SURROUNDING THE HEATING CHAMBER, A HOT AIR DUCT DISPOSED LONGITUDINALLY IN THE CENTER OF THE UPPER PORTION OF SAID HEATING CHAMBER WITH NOZZLES DISPOSED ALONG ITS LENGTH FOR DELIVERING HOT AIR INTO THE HEATING CHAMBER IN A DOWNWARD DIRECTION, AND MEANS FOR REMOVING HOT AIR FROM THE LOWER PORTION OF THE HEATING CHAMBER AND FOR RECYCLING SAID REMOVED HOT AIR TO SAID DUCT.
Claim 2
Dependent Claim
152 words
AN ELECTRIC RESISTANCE FURNACE WITH CIRCULATION OF HOT AIR BY RECYCLING, COMPRISING AN OUTER FRAMEWORK, A HEATING CHAMBER SUBSTANTIALLY CONSTITUTED BY TRANSVERSELY EXTENDING THIN FLAT METAL STRIPS WHICH FORM ELECTRIC HEATING RESISTANCES, SAID STRIPS EXTENDING OVER THE TOP AND AT LEAST A PORTION OF THE SIDES OF SAID HEATING CHAMBER AND BEING ARRANGED IN SUCCESSION ALONG THE LENGTH OF THE FURNACE WITH SPACES BETWEEN THEM, SUSPENSION MEANS SUPPORTING SAID STRIPS AND FIXED TO SAID FRAMEWORK, A LINING OF THERMAL INSULATION CARRIED DIRECTLY ON AND SUPPORTED BY SAID STRIPS AND SURROUNDING THE HEATING CHAMBER, A HOT AIR DUCT DISPOSED LONGITUDINALLY IN THE CENTER OF THE UPPER PORTION OF SAID HEATING CHAMBER WITH NOZZLES DISPOSED ALONG ITS LENGTH FOR DELIVERING HOT AIR INTO THE HEATING CHAMBER IN A DOWNWARD DIRECTION, AND MEANS FOR REMOVING HOT AIR FROM THE LOWER PORTION OF THE HEATING CHAMBER AND FOR RECYCLING SAID REMOVED HOT AIR TO SAID DUCT.
References Cited (Backward Citations)
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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) | 1967-08-25 | 1968-02-24 | 1968-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-25 | 1972-02-24 | 1972-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-25 | 1976-02-24 | 1976-08-25 | $7700.00 | Window Closed / Lapsed |