US3737553A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum electric furnace
Assignee: ABAR IPSEN INDUSTRIES A NY LP
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Filing: 1971-12-09
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Granted: 1973-06-05
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Expires: 1991-12-09
Abstract
Abstract An electric furnace is disclosed for operation at vacuum with or without inert gas with an external water cooled enclosure having an access door and within which enclosure large areas low mass quick heating resistance elements are provided for the back and front, sides, top and bottom with independent control of the heating elements, programmed if desired, the heating units being shielded to minimize heat loss outside the enclosure by low mass shielding elements including a baffle in one wall which permits rapid gas exit for fast pump down to obtain a fast cycle time while limiting external thermal radiation losses from the shielded area.
Inventors
- 👤 B Kreider
- 👤 W Jones
- 👤 W Metalsky
- 👤 T Gibb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:14
CPC Classifications
F; F27; F27D; F27D11/00; F27D11/02; H; H05; H05B; H05B3/00; H05B3/0019
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
103 words
A vacuum electric furnace comprising a closed tank having a plurality of enclosing walls and a removable closure wall providing in the interior a working space, each of the said walls having a self-sustaining reflective radiation shield member spaced inwardly therefrom, means carried by said walls for supporting said shield members, each of said shield members having spaced inwardly therefrom a resistance heating element with terminal ends and comprising flat strips of metal covering a substantial portion of the corresponding shield member, and means carried by each of said shield members for supporting said resistance heating elements at a plurality of spaced locations.
Claim 2
Dependent Claim
103 words
A vacuum electric furnace comprising a closed tank having a plurality of enclosing walls and a removable closure wall providing in the interior a working space, each of the said walls having a self-sustaining reflective radiation shield member spaced inwardly therefrom, means carried by said walls for supporting said shield members, each of said shield members having spaced inwardly therefrom a resistance heating element with terminal ends and comprising flat strips of metal covering a substantial portion of the corresponding shield member, and means carried by each of said shield members for supporting said resistance heating elements at a plurality of spaced locations.
Claim 3
Dependent Claim
37 words
A vacuum electric furnace as defined in claim 1 in which the exposed area of said heating elements is in the range of from 40 to 80 percent of the exposed area of the radiation shield members.
Claim 4
Dependent Claim
32 words
A vacuum electric furnace as defined in claim 1 in which said heating elements each comprises a plurality of parallel strips disposed in a plane bounding the working space in the furnace.
Claim 5
Dependent Claim
26 words
A vacuum electric furnace as defined in claim 1 in which each of said shield members for each wall comprises a single thickness of reflective metal.
Claim 6
Dependent Claim
37 words
A vacuum electric furnace as defined in claim 1 in which means is provided for controlling the energy supplied to said heating elements, and said means includes temperature responsive sensing means in the interior of said tank.
Claim 7
Dependent Claim
30 words
A vacuum electric furnace as defined in claim 5 in which said temperature responsive sensing means has a portion secured on the inward facing portion of one of the strips.
Claim 8
Dependent Claim
32 words
A vacuum electric furnace as defined in claim 1 in which the marginal edges of each of said shield members are in meeting relation to the marginal edges of contiguous shield members.
Claim 9
Dependent Claim
97 words
A vacuum electric furnace comprising a closed tank having a plurality of enclosing walls and a removable closure wall providing in the interior a working space, each of said walls having a radiation shield member spaced inwardly therefor, each of said shield members having spaced inwardly therefrom and carried thereby a resistance heating element with terminal ends and comprising flat strips of metal covering a substantial portion of the corresponding shield member, and the shield member of one of said walls having an opening therethrough closed by an optically dense fluid flow baffle for gas withdrawal therethrOugh.
Claim 10
Dependent Claim
97 words
A vacuum electric furnace comprising a closed tank having a plurality of enclosing walls and a removable closure wall providing in the interior a working space, each of said walls having a radiation shield member spaced inwardly therefor, each of said shield members having spaced inwardly therefrom and carried thereby a resistance heating element with terminal ends and comprising flat strips of metal covering a substantial portion of the corresponding shield member, and the shield member of one of said walls having an opening therethrough closed by an optically dense fluid flow baffle for gas withdrawal therethrOugh.
Claim 11
Dependent Claim
51 words
A vacuum electric furnace as defined in claim 8 in which said baffle member includes a plurality of parallel walls angularly disposed with respect to the contiguous shield member to permit rapid discharge of gas therethrough and with their respective edges disposed to block passage of thermal radiation through said baffle.
Claim 12
Dependent Claim
38 words
A vacuum electric furnace as defined in claim 1 in which said enclosing walls comprise opposite parallel vertical side walls, horizontal top and bottom walls, a vertical rear wall and said removable closure wall is a front wall.
Claim 13
Dependent Claim
65 words
In combination a flat radiation shield member of a single thickness of reflective metal for attachment to a furnace wall, and a resistance heating element in spaced relation to and secured to said shield member comprising a plurality of flat parallel strips of metal with their edges in closely spaced relation, said shield member being self-sustaining and having stiffening portions extending between marginal edges thereof.
Claim 14
Dependent Claim
65 words
In combination a flat radiation shield member of a single thickness of reflective metal for attachment to a furnace wall, and a resistance heating element in spaced relation to and secured to said shield member comprising a plurality of flat parallel strips of metal with their edges in closely spaced relation, said shield member being self-sustaining and having stiffening portions extending between marginal edges thereof.
Claim 15
Dependent Claim
20 words
The combination defined in claim 11 in which each of the heating strips is of a single thickness of metal.
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) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |