Patent US3973101A successfully refreshed from Google Patents.
US3973101A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric air heating furnace
Assignee: Individual
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Filing: 1974-05-31
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Granted: 1976-08-03
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Expires: 1994-05-31
Abstract
Abstract An electric furnace comprised of an outer casing, a support casing and a heater casing, the outer casing has a substantially rectangular cross-section with air inlet openings formed in the lower portion of the back wall and in the upper portion thereof whereas air outlet openings are formed in the lower portion of the front and side walls of the same. The support casing is mounted within and in space relationship with the outer casing and the heater casing is within but spaced from the support casing, both support and heater casings are provided with a circular opening in registry at the upper portion of their back wall. An air propeller is mounted onto the support casing in alignment with the circular openings to blow air from the inlet openings, through the circular openings, along a plurality of elongated electrical heating elements vertically disposed in the heater casing, and outwardly through further openings formed in the bottom of the heater casing, in the lower portion of the support casing and through the outlet openings of the outer casing. Control means are provided to turn the heating elements on in timed sequence. The speed of the propeller can also be automatically increased in direct relation to the number of heating elements turned on. Various safety controls can also be provided.
Inventors
- 👤 Andre Bosse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:51
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/275; F; F24; F24H; F24H3/00; F24H3/02; F24H3/04; F24H3/0405; F24H3/0411
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
116 words
An electric furnace comprising in combination: -- an outer casing of a substantially rectangular cross-section having top, bottom, front, back and side walls, air inlet openings formed in the lower portion of the back wall and in the upper portion of said outer casing, air outlet openings formed in the lower portion of the front and side walls thereof; -- an open top support casing having walls substantially parallel to and within said outer casing, an air inlet circular opening and a further air inlet opening being formed in the upper portion and lower portion, respectively, of the back wall of said support casing, the support casing being mounted in spaced relationship with said outer casing;
Claim 2
Dependent Claim
116 words
An electric furnace comprising in combination: -- an outer casing of a substantially rectangular cross-section having top, bottom, front, back and side walls, air inlet openings formed in the lower portion of the back wall and in the upper portion of said outer casing, air outlet openings formed in the lower portion of the front and side walls thereof; -- an open top support casing having walls substantially parallel to and within said outer casing, an air inlet circular opening and a further air inlet opening being formed in the upper portion and lower portion, respectively, of the back wall of said support casing, the support casing being mounted in spaced relationship with said outer casing;
Claim 3
Dependent Claim
251 words
-- an open top heater casing within but spaced from said support casing and having walls substantially parallel to the support casing walls, an air inlet circular opening in registry with the air inlet circular opening at the upper portion of the support casing being formed in the back wall of said heater casing, air outlet openings being provided at the lower portion of the front and side walls of the heater casing, means extending through the bottom portion of the support casing for communicating the air outlet openings of the heater casing with the air outlet openings of the outer casing; -- a single cover extending over said support and heater casing; -- a plurality of elongated electrical heating elements vertically disposed in said heater casing in the airflow path therethrough, the heating elements being supported at the ends thereof by said cover; and -- an air propelling means mounted onto said support casing in alignment with the air inlet circular openings provided in the upper portion of the support and heater casings to blow air from said air inlet openings of said outer casing, through said circular air inlet opening and said further opening of said support casing, into the circular air inlet opening of the heater casing and along the heating elements in the heater casing and outwardly through air outlet openings provided at the bottom portion of the heater casing, and then through the communicating means into and through the air outlet openings of the outer casing.
Claim 4
Dependent Claim
251 words
-- an open top heater casing within but spaced from said support casing and having walls substantially parallel to the support casing walls, an air inlet circular opening in registry with the air inlet circular opening at the upper portion of the support casing being formed in the back wall of said heater casing, air outlet openings being provided at the lower portion of the front and side walls of the heater casing, means extending through the bottom portion of the support casing for communicating the air outlet openings of the heater casing with the air outlet openings of the outer casing; -- a single cover extending over said support and heater casing; -- a plurality of elongated electrical heating elements vertically disposed in said heater casing in the airflow path therethrough, the heating elements being supported at the ends thereof by said cover; and -- an air propelling means mounted onto said support casing in alignment with the air inlet circular openings provided in the upper portion of the support and heater casings to blow air from said air inlet openings of said outer casing, through said circular air inlet opening and said further opening of said support casing, into the circular air inlet opening of the heater casing and along the heating elements in the heater casing and outwardly through air outlet openings provided at the bottom portion of the heater casing, and then through the communicating means into and through the air outlet openings of the outer casing.
Claim 5
Dependent Claim
45 words
An electric furnace as claimed in claim 1, wherein the communicating means comprises a duct means connecting the air outlet openings at the bottom portion of the heater casing with the air outlet openings of the outer casing, and wherein the heating elements are U-shaped.
Claim 6
Dependent Claim
82 words
An electric furnace as claimed in claim 2, wherein the duct means forms an integral part of the heater casing, the back wall of the duct means being an extension of the back wall of the heater casing and the duct means having a flange extending horizontally out from the side and front walls of the heater casing toward the front and side walls of the outer casing, respectively, said horizontal flange extending above the air outlet openings of said outer casing.
Claim 7
Dependent Claim
21 words
An electric furnace as claimed in claim 3, including seal means for connecting the duct means to the outer casing walls.
Claim 8
Dependent Claim
68 words
An electric furnace as claimed in claim 3, wherein the heater casing is mounted in spaced relation to the support casing by means of a member forwardly extending from the back wall of the support casing, said member having an upturned lip at the forend thereof for supporting the duct means, and a spacer member inserted between the support and heater casing walls at the upper portion thereof.
Claim 9
Dependent Claim
32 words
An electric furnace as claimed in claim 1, wherein the heating elements are arranged in at least two groups, and control means are provided for turning the groups on in timed sequence.
Claim 10
Dependent Claim
54 words
An electric furnace as claimed in claim 6, wherein the air propelling means is operated by an electric motor having at least two speeds, and control means are provided, after the start of operation of the furnace, for increasing the speed of the motor as an additional group of heating elements is turned on.
Claim 11
Dependent Claim
32 words
An electric furnace as claimed in claim 7, including means for allowing the air propelling means to operated for a predetermined period of time after the heating elements have been turned off.
Claim 12
Dependent Claim
20 words
An electric furnace as claimed in claim 7, including means for selectively actuating only a single group of heating elements.
Claim 13
Dependent Claim
39 words
An electric furnace as claimed in claim 7, wherein a temperature limit switch is connected in series with each group of heating elements to shut off the same whenever the temperature inside the heater casing exceeds a predetermined level.
Claim 14
Dependent Claim
23 words
An electric furnace as claimed in claim 1, wherein the inner surface of the heater casing is made of a highly reflective material.
References Cited (Backward Citations)
US1534221A
Cited
US1694351A
Cited
US1828810A
Cited
US2158602A
Cited
US2471784A
Cited
US2498054A
Cited
US2600044A
Cited
US2721254A
Cited
US2971076A
Cited
US3104307A
Cited
US3046380A
Cited
US3575582A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-03 | 1980-02-02 | 1980-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-03 | 1984-02-02 | 1984-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-03 | 1988-02-02 | 1988-08-03 | $7700.00 | Window Closed / Lapsed |