Patent US5404387A successfully refreshed from Google Patents.
Patent US4055723A successfully refreshed from Google Patents.
US4055723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heater support element for electric furnace
Assignee: Leeds and Northrup Co
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Filing: 1976-07-19
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Granted: 1977-10-25
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Expires: 1996-07-19
Abstract
Abstract A supporting means for a flexible graphite cloth heating element comprised of a conductive bar having a dovetail shaped slot and a mandrel shaped to fit within the slot and to hold a loop of the graphite cloth heating element therein.
Inventors
- 👤 Wallace Snow Vanderford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:07
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/62; H05B3/66; H05B3/02; H05B3/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
134 words
In an electric furnace having an electric heater formed of aflexible material, an improved electrical connecting and supporting element for said heater comprising a bar of electrically conductive material having in a face thereof a longitudinal slot parallel with the longitudinal axis of said bar with the width of its entrance of lesser dimension than the width of the inner portion of said slot to receive within said slot a loop of said flexible electric heater, and a mandrel having a cross-sectional dimension greater than said width of said entrance and less than said width of said inner portion of said slot inserted within said loop within said slot whereby said flexible material is mechanically secured to said bar of electrically conductive material and provides an electrical connection between said bar and said heater.
Claim 2
Dependent Claim
134 words
In an electric furnace having an electric heater formed of aflexible material, an improved electrical connecting and supporting element for said heater comprising a bar of electrically conductive material having in a face thereof a longitudinal slot parallel with the longitudinal axis of said bar with the width of its entrance of lesser dimension than the width of the inner portion of said slot to receive within said slot a loop of said flexible electric heater, and a mandrel having a cross-sectional dimension greater than said width of said entrance and less than said width of said inner portion of said slot inserted within said loop within said slot whereby said flexible material is mechanically secured to said bar of electrically conductive material and provides an electrical connection between said bar and said heater.
Claim 3
Dependent Claim
13 words
The connecting element of claim 1 in which said slot is dovetail shaped.
Claim 4
Dependent Claim
14 words
The connecting element of claim 1 in which said mandrel is cylindrical in shape.
Claim 5
Dependent Claim
19 words
The connecting element of claim 1 in which one end of said mandrel is provided with an enlarged portion.
Claim 6
Dependent Claim
19 words
The connecting element of claim 1 including means for securing said bar in fixed spatial relation in said furnace.
Claim 7
Dependent Claim
37 words
The connecting element of claim 4 in which said securing means includes a cylindrical extension of electrically conductive material attached to said bar to support said bar and to serve as the electrical connector for said heater.
Claim 8
Dependent Claim
31 words
The combination of claim 5 in which said furnace includes a heat insulated heating chamber with said cylindrical extensions of said securing means extending through openings in said insulated heating chamber.
Claim 9
Dependent Claim
37 words
The combination of claim 6 in which said heat insulated heating chamber is surrounded by a rigid metallic cage, and electrically insulating means for securing said electrically conductive cylindrical extensions in fixed spatial relation to said cage.
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) | 1980-10-24 | 1981-04-25 | 1981-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-24 | 1985-04-25 | 1985-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-24 | 1989-04-25 | 1989-10-25 | $7700.00 | Window Closed / Lapsed |