US4087777A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical heating assembly having a thermally conductive refractory electrical insulating embedding composition between an electrically conductive member and a jacket
Assignee: Dynamit Nobel AG
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Filing: 1976-01-02
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Granted: 1978-05-02
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Expires: 1996-01-02
Abstract
Abstract A thermally conductive refractory electrical insulating embedding composition comprising granular magnesium oxide and granular fused magnesium iron alumino silicate; and electrical heating assembly having an electrically conductive heating member and a jacket and disposed between said member and said jacket a thermally conductive refractory electrically insulating embedding composition comprising granular magnesium oxide and granular fused magnesium iron alumino silicate.
Inventors
- 👤 Helmut Clasen
- 👤 Klaus Deneke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:05
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/002; H01B3/006; C; C04; C04B; C04B35/00; C04B35/01; C04B35/03; C04B35/04; H01C; H01C7/00; H01C7/001; H05; H05B; H05B3/00; H05B3/10; H05B3/18
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
41 words
An electrical heating assembly having an electrically conductive member and a jacket disposed thereabout and disposed between said member and said jacket a thermally conductive, refractory, electrical insulating embedding composition comprising granular magnesium oxide and granular fused magnesium iron alumino silicate.
Claim 2
Dependent Claim
41 words
An electrical heating assembly having an electrically conductive member and a jacket disposed thereabout and disposed between said member and said jacket a thermally conductive, refractory, electrical insulating embedding composition comprising granular magnesium oxide and granular fused magnesium iron alumino silicate.
Claim 3
Dependent Claim
34 words
An electrical heating assembly according to claim 1 wherein said magnesium iron alumino silicate is present in said composition in an amount of 0.5 to 4% based on the weight of said magnesium oxide.
Claim 4
Dependent Claim
36 words
An electrical heating assembly according to claim 2 wherein said magnesium iron alumino silicate is present in said composition in an amount of 1 to 2 weight percent, based on the weight of said magnesium oxide.
Claim 5
Dependent Claim
40 words
An electrical heating assembly according to claim 2 wherein said magnesium iron alumino silicate has a composition as follows: ______________________________________
Weight Percent
______________________________________
silica 40 to 75
alumina 15 to 35
MgO 5 to 25
FeO 5 to 20
______________________________________
Claim 6
Dependent Claim
40 words
An electrical heating assembly according to claim 4 wherein said magnesium iron alumino silicate has a composition as follows: ______________________________________
Weight percent
______________________________________
silica 45 to 65
alumina 20 to 30
MgO 10 to 20
FeO 10 to 15
______________________________________
Claim 7
Dependent Claim
26 words
An electrical heating assembly according to claim 1 wherein said jacket is a tubular jacket and said electrically conductive member is a voltage carrying heating coil.
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) | 1981-05-01 | 1981-10-31 | 1982-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-01 | 1985-10-31 | 1986-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-01 | 1989-10-31 | 1990-05-02 | $7700.00 | Window Closed / Lapsed |