US4217466A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite insulators
Assignee: Ceramtec GmbH
•
Filing: 1977-11-03
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Granted: 1980-08-12
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Expires: 1997-11-03
Abstract
Abstract An elongated electrical insulator has a supporting rod and barriers or screens spaced along the rod; an intermediate layer of material between the rod and the barriers or screens serves to exclude atmospheric moisture and other materials enhancing the electrical insulating characteristics of the insulator. The rod comprises a non-saponifiable resin reinforced with fiber glass of low alkali content. The barriers or screens comprise a non-saponifiable moisture-repellent polymer containing a filler. The intermediate layer comprises a moisture-repellent non-saponifiable polymer.
Inventors
- 👤 Martin Kuhl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:41
CPC Classifications
H; H01; H01B; H01B17/00; H01B17/32
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
57 words
A composite insulator, comprising a rod with screens surrounding it and an intermediate layer between the rod and the screens in which the rod comprises a non-saponifiable resin reinforced with glass fibers of low alkali content, the screens being of a moisture-repellent, non-saponifiable polymer containing a filler and the intermediate layer being of a moisture-repellent, non-saponifiable polymer.
Claim 2
Dependent Claim
57 words
A composite insulator, comprising a rod with screens surrounding it and an intermediate layer between the rod and the screens in which the rod comprises a non-saponifiable resin reinforced with glass fibers of low alkali content, the screens being of a moisture-repellent, non-saponifiable polymer containing a filler and the intermediate layer being of a moisture-repellent, non-saponifiable polymer.
Claim 3
Dependent Claim
27 words
The insulator of claim 1 in which the screens contain, as filler, 20 to 70% by weight of an alkali-free, hydrated metal oxide surface-treated with a silane.
Claim 4
Dependent Claim
21 words
The insulator of claim 2 in which the filler is present in an amount of about 20 to 30% by weight.
Claim 5
Dependent Claim
42 words
The insulator of claim 2 in which the polymer of the screens and of the intermediate layer have glass transition temperatures below -50° C. and in which the resin on said rod has a glass transition temperature of more than 100° C.
Claim 6
Dependent Claim
69 words
The insulator of claim 4 in which said resin is a bisphenol A epoxy resin containing an aromatic diamine as hardener and said glass fibers have an alkali content of less than 0.8%, the resin of said screens is a silicone rubber, said filler is aluminum hydroxide surface treated with a vinyl silane and said intermediate layer comprises a polyorganodimethyl siloxane containing a silanized dispersed silicic acid as filler.
Claim 7
Dependent Claim
60 words
The insulator of claim 4 in which said resin is a cycloaliphatic epoxy resin containing acetal bonds and a dicarboxylic anhydride as hardener, said polymer of said screens is an ethylene-propylene rubber containing aluminum hydroxide surface treated with a vinyl silane, and said intermediate layer is of an un-crossed link polyorganodimethyl siloxane containing a silanized dispersed silicic acid as filler.
Claim 8
Dependent Claim
46 words
The insulator of claim 4 in which the alkali contents of the glass fiber is less than 0.8% by weight and in which the intermediate layer has a modulus of elasticity which is greater than that of the screens and less than that of the rod.
Claim 9
Dependent Claim
15 words
The insulator of claim 1 in which the resin of the rod contains ether bonds.
Claim 10
Dependent Claim
21 words
The insulator of claim 1 in which the resin of the rod is a cross-linked polyaryl compound free of saponifiable moieties.
Claim 11
Dependent Claim
19 words
The insulator of claim 1 in which the alkali content of the glass fiber is less than 0.8% wt.
Claim 12
Dependent Claim
15 words
The insulator according of claim 1 in which the intermediate layer comprises a polyorganodimethyl siloxane.
Claim 13
Dependent Claim
23 words
The insulator of claim 11 in which the intermediate layer comprises a linear polyorganodimethyl siloxane containing a silanized dispersed silicic acid as filler.
Claim 14
Dependent Claim
30 words
The insulator of claim 1 in which the intermediate layer has a modulus of elasticity which is greater than that of the screens and less than that of the rod.
Claim 15
Dependent Claim
13 words
The insulator of claim 1 in which the intermediate layer is highly cross-linked.
Claim 16
Dependent Claim
13 words
The insulator of claim 1 in which the intermediate layer is weakly cross-linked.
Claim 17
Dependent Claim
23 words
The insulator of claim 1 in which the screens are individual structures successively mounted on said rod and push fit on said rod.
Claim 18
Dependent Claim
18 words
The insulator of claim 1 in which the screens are cast onto said rod forming a seal therewith.
Claim 19
Dependent Claim
38 words
The insulator of claim 1 in which each of the screens has a tubular part and a part opening in trumpet from, the tubular part of each screen fitting into the trumpet-like opened part of the preceding screen.
Claim 20
Dependent Claim
15 words
The insulator of claim 1 in which the resin of the rod contains acetal bonds.
References Cited (Backward Citations)
DE1081223B
Cited
GB1116197A
Cited
GB1292276A
Cited
DE1921299A1
Cited
US4001128A
Cited
US3898372A
Cited
DE2425076A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-08-12 | 1984-02-11 | 1984-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-12 | 1988-02-11 | 1988-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-12 | 1992-02-11 | 1992-08-12 | $7700.00 | Window Closed / Lapsed |