Patent US3175550A successfully refreshed from Google Patents.
US3175550A
Expired / Lapsed
US
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Dual air heater
Assignee: Knapp Monarch Co
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Filing: 1963-02-25
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Granted: 1965-03-30
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Expires: 1983-02-25
Abstract
No abstract record available.
Inventors
- 👤 Robert S Knapp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:47
CPC Classifications
F; F24; F24C; F24C7/00; F24C7/04; F24C7/043; F24C1/00; F24C1/14; F24C7/08; F24C7/081; F24H; F24H3/00; F24H3/02; F24H3/04; F24H3/0405; F24H3/0411; F24H3/0417
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
163 words
AN AIR HEATER FOR SELECTIVELY PRODUCING HEATING EFFECT AT TWO DISTINCT HEATING LEVELS WHEREIN ONE HEATING LEVEL IS PRIMARILY A FUNCTION OF RADIANT HEAT AND THE OTHER HEATING LEVEL APPEARS PRIMARILY AS A FUNCTION OF CONVECTION HEATING, SAID HEATER COMPRISING, IN COMBINATION: HOUSING MEANS DEFINING A SUBSTANTIALLY ENCLOSED CHAMBER IN WHICH AIR IS TO BE PRESSURIZED AND AN OPEN-SIDED CHAMBER WHOSE OPEN-SIDE IS SUBSTANTIALLY UNOBSTRUCTED AND THROUGH WHICH HEAT IS TO EMANATE, SAID HOUSING MEANS INCLUDING TWO APERTURED WALLS THAT ARE COMMON BETWEEN THE TWO SAID CHAMBERS, HEATING MEANS OF THE TYPE WHICH NORMALLY GLOWS WHEN ENERGIZED SO AS TO PRODUCE PRIMARILY RADIANT HEAT THEREFROM CARRIED ON SAID HOUSING MEANS IN SAID OPEN-SIDED CHAMBER, AIR-PRESSURIZING MEANS CARRIED ON SAID HOUSING MEANS AND ARRANGED FOR INGESTING AIR INTO SAID SUBSTANTIALLY ENCLOSED CHAMBER AND FOR PRESSURIZING THE AIR THEREIN, THE SAID TWO APERTURED WALLS BEING TRANSVERSE TO EACH OTHER AND EACH HAVING A FACE WHICH FACES INTO THE OPEN-SIDED CHAMBER WITH ONE WALL FACING THE
Claim 2
Dependent Claim
163 words
AN AIR HEATER FOR SELECTIVELY PRODUCING HEATING EFFECT AT TWO DISTINCT HEATING LEVELS WHEREIN ONE HEATING LEVEL IS PRIMARILY A FUNCTION OF RADIANT HEAT AND THE OTHER HEATING LEVEL APPEARS PRIMARILY AS A FUNCTION OF CONVECTION HEATING, SAID HEATER COMPRISING, IN COMBINATION: HOUSING MEANS DEFINING A SUBSTANTIALLY ENCLOSED CHAMBER IN WHICH AIR IS TO BE PRESSURIZED AND AN OPEN-SIDED CHAMBER WHOSE OPEN-SIDE IS SUBSTANTIALLY UNOBSTRUCTED AND THROUGH WHICH HEAT IS TO EMANATE, SAID HOUSING MEANS INCLUDING TWO APERTURED WALLS THAT ARE COMMON BETWEEN THE TWO SAID CHAMBERS, HEATING MEANS OF THE TYPE WHICH NORMALLY GLOWS WHEN ENERGIZED SO AS TO PRODUCE PRIMARILY RADIANT HEAT THEREFROM CARRIED ON SAID HOUSING MEANS IN SAID OPEN-SIDED CHAMBER, AIR-PRESSURIZING MEANS CARRIED ON SAID HOUSING MEANS AND ARRANGED FOR INGESTING AIR INTO SAID SUBSTANTIALLY ENCLOSED CHAMBER AND FOR PRESSURIZING THE AIR THEREIN, THE SAID TWO APERTURED WALLS BEING TRANSVERSE TO EACH OTHER AND EACH HAVING A FACE WHICH FACES INTO THE OPEN-SIDED CHAMBER WITH ONE WALL FACING THE
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) | 1968-03-29 | 1968-09-28 | 1969-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-29 | 1972-09-28 | 1973-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-29 | 1976-09-28 | 1977-03-30 | $7700.00 | Window Closed / Lapsed |