Patent US4433081A successfully refreshed from Google Patents.
US4433081A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical insulation body
Assignee: BBC BROWN BOVERI and COMPANY Ltd
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Filing: 1982-01-27
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Granted: 1984-02-21
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Expires: 2002-01-27
Abstract
Abstract Provided is an electrical insulation body useful in electrical installations operated with SF 6 as a quenching and/or insulating gas. The insulation body is comprised of a thermosetting resin matrix and a mineral filler of predominantly quartz powder and from about 5 to 50 percent by weight of the mineral filler of a second mineral powder component for increasing resistance to SF 6 cleavage products, which second component comprises at least one alkaline earth metal carbonate.
Inventors
- 👤 Helmut Britsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:56
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/02; H01B3/08; H01B3/084; H01B3/002; H01B3/006; H01B3/18; H01B3/30; H01B3/40; H01H; H01H33/00; H01H33/02; H01H33/021; Y; Y10; Y10S; Y10S174/00; Y10S174/01
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
67 words
An electrical insulation body in an environment of SF 6 gas comprising a matrix of a thermoset resin and a mineral filler, with the mineral filler comprising predominantly quartz powder and from about 5 to 50 percent by weight of said mineral filler of a second mineral powder component for increasing resistance to SF 6 cleavage products, which component comprises at least one alkaline earth metal carbonate.
Claim 2
Dependent Claim
67 words
An electrical insulation body in an environment of SF 6 gas comprising a matrix of a thermoset resin and a mineral filler, with the mineral filler comprising predominantly quartz powder and from about 5 to 50 percent by weight of said mineral filler of a second mineral powder component for increasing resistance to SF 6 cleavage products, which component comprises at least one alkaline earth metal carbonate.
Claim 3
Dependent Claim
26 words
The insulation body of claim 1, wherein the second mineral powder component comprises from about 10 to about 30 percent by weight of the mineral filler.
Claim 4
Dependent Claim
19 words
The insulation body of claim 1 or 2 wherein the resin matrix is comprised of a crosslinked epoxy resin.
Claim 5
Dependent Claim
23 words
The insulation body of claim 1 or 2, wherein the second mineral powder component is calcium carbonate, magnesium carbonate or a mixture thereof.
Claim 6
Dependent Claim
15 words
The insulation body of claim 4, wherein the second mineral powder component is pulverulent dolomite.
Claim 7
Dependent Claim
17 words
The insulation body of claim 4, wherein the resin matrix is comprised of a crosslinked epoxy resin.
Claim 8
Dependent Claim
24 words
The insulation body of claim 4, wherein the granularity of the second mineral powder component is of a finer nature than the quartz powder.
Claim 9
Dependent Claim
91 words
An electrical installation including at least one electrical insulator in contact with a sealed environment containing gaseous sulfur hexafluoride, said insulator comprising a matrix of a thermoset resin and a mineral particulate filler distributed homogeneously throughout the matrix, the improvement which comprises said mineral particulate filler in the matrix comprising a predominant amount of quartz powder and from about 5 to 50 percent by weight, based upon the total weight of said mineral particulate filler, of a second mineral powder which is comprised of at least one alkaline earth metal carbonate.
Claim 10
Dependent Claim
91 words
An electrical installation including at least one electrical insulator in contact with a sealed environment containing gaseous sulfur hexafluoride, said insulator comprising a matrix of a thermoset resin and a mineral particulate filler distributed homogeneously throughout the matrix, the improvement which comprises said mineral particulate filler in the matrix comprising a predominant amount of quartz powder and from about 5 to 50 percent by weight, based upon the total weight of said mineral particulate filler, of a second mineral powder which is comprised of at least one alkaline earth metal carbonate.
Claim 11
Dependent Claim
38 words
The electrical installation of claim 8, wherein the second mineral powder comprises calcium carbonate, magnesium carbonate or a mixture thereof and wherein the amount of second mineral powder ranges from about 10 to about 30 percent by weight.
Claim 12
Dependent Claim
15 words
The electrical installation of claim 8, wherein the alkaline earth metal carbonate is dolomite powder.
References Cited (Backward Citations)
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GB1213625A
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GB1240403A
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JPS5119099A
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DE2810035A1
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-20 | 1987-08-22 | 1988-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-20 | 1991-08-22 | 1992-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-20 | 1995-08-22 | 1996-02-21 | $7700.00 | Window Closed / Lapsed |