Patent US3171399A successfully refreshed from Google Patents.
US3171399A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Space heater
Assignee: QUALIFIED RANGE CO Inc
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Filing: 1961-08-11
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Granted: 1965-03-02
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Expires: 1981-08-11
Abstract
No abstract record available.
Inventors
- 👤 Walter B Kirgan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:26
CPC Classifications
F; F24; F24H; F24H3/00; F24H3/02; F24H3/06; F24H3/067
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
177 words
A WOOD BURNING SPACE HEATER COMPRISING A FIRE BOX HAVING A FRONT WALL FORMING THE FRONT OF THE HEATER FOR DIRECT RADIATION THEREFROM, A BACK WALL, SIDE WALL FORMING THE SIDES OF THE HEATER FOR DIRECT SPATIAL RADIATION, A TOP AND A BOTTOM, A GRATE IN SAID FIRE BOX FOR SUPPORTING WOOD TO BE BURNED, AN ASH PAN COMPARTMENT BENEATHS SAID GRATE IN SAID FIRE BOX, MEANS DEFINING PASSAGEWAYS BETWEEN SAID GRATE AND SAID SIDE WALLS EXTENDING FROM ABOVE SAID GRATE AND OPENING BELOW SAID ASH PAN COMPARTMENT FOR THE FLOW OF HOT FLUE GASES DOWNWARDLY ADJACENT THE SIDES OF SAID HEATER, MEANS ADJACENT THE BOTTOM OF SAID HEATER DEFINING A FLUE GAS COLLECTION CHAMBER FOR RECEIVING HOT FLUE GASES FROM SAID PASSAGEWAYS, MEANS ON SAID BACK DEFINING A FLUE PIPE OPENING AT THE BOTTOM INTO SAID CHAMBER AND ARRANGED TO CONDUCT SAID FLUE GASES UPWARDLY ADJACENT SAID BACK WALL FOR DISCHARGE INTO A CHIMNEY, A FORCED AIR SYSTEM FOR REMOVING HEAT FROM SAID TOP, BACK WALL AND BOTTOM OF SAID FIRE BOX FOR CONDUCTION THEREFROM INCLUDING
Claim 2
Dependent Claim
177 words
A WOOD BURNING SPACE HEATER COMPRISING A FIRE BOX HAVING A FRONT WALL FORMING THE FRONT OF THE HEATER FOR DIRECT RADIATION THEREFROM, A BACK WALL, SIDE WALL FORMING THE SIDES OF THE HEATER FOR DIRECT SPATIAL RADIATION, A TOP AND A BOTTOM, A GRATE IN SAID FIRE BOX FOR SUPPORTING WOOD TO BE BURNED, AN ASH PAN COMPARTMENT BENEATHS SAID GRATE IN SAID FIRE BOX, MEANS DEFINING PASSAGEWAYS BETWEEN SAID GRATE AND SAID SIDE WALLS EXTENDING FROM ABOVE SAID GRATE AND OPENING BELOW SAID ASH PAN COMPARTMENT FOR THE FLOW OF HOT FLUE GASES DOWNWARDLY ADJACENT THE SIDES OF SAID HEATER, MEANS ADJACENT THE BOTTOM OF SAID HEATER DEFINING A FLUE GAS COLLECTION CHAMBER FOR RECEIVING HOT FLUE GASES FROM SAID PASSAGEWAYS, MEANS ON SAID BACK DEFINING A FLUE PIPE OPENING AT THE BOTTOM INTO SAID CHAMBER AND ARRANGED TO CONDUCT SAID FLUE GASES UPWARDLY ADJACENT SAID BACK WALL FOR DISCHARGE INTO A CHIMNEY, A FORCED AIR SYSTEM FOR REMOVING HEAT FROM SAID TOP, BACK WALL AND BOTTOM OF SAID FIRE BOX FOR CONDUCTION THEREFROM INCLUDING
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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) | 1968-03-01 | 1968-08-31 | 1969-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-01 | 1972-08-31 | 1973-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-01 | 1976-08-31 | 1977-03-02 | $7700.00 | Window Closed / Lapsed |