US4011168A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arc track resistant composition
Assignee: Dow Silicones Corp
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Filing: 1974-05-06
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Granted: 1977-03-08
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Expires: 1994-05-06
Abstract
Abstract A composition consisting essentially of a specific siloxane fluid and a specific type of filler is disclosed to be useful as an electrical coating particularly where arc track resistant characteristics are needed.
Inventors
- 👤 John G. Uhlmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:51
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/46; H01B3/465; C; C08; C08K; C08K3/00; C08K3/01; C08K3/013; C08L; C08L83/00; C08L83/04; H01B3/002; H01B3/006; C08G; C08G77/00; C08G77/04; C08G77/70
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
121 words
A composition consisting essentially of 20 to 50 percent by weight of a siloxane fluid having a viscosity in the range of 100 to 5000 centistokes at 25° C., the substituents on the silicon atoms in the siloxane fluid being hydrocarbon radicals containing 1 to 18 carbon atoms, 50 to 80 percent by weight of a mineral filler selected from the group consisting of clays, ground quartz, gypsum, silica and aluminum, and which also contains up to 6 percent by weight of a siloxane resin composed of SiO 2 and (CH 3 ) 3 SiO 1/2 units, the ratio of the SiO 2 units to the (CH 3 ) 3 SiO 1/2 units being in the range of 1:0.6 to 1:1.2.
Claim 2
Dependent Claim
121 words
A composition consisting essentially of 20 to 50 percent by weight of a siloxane fluid having a viscosity in the range of 100 to 5000 centistokes at 25° C., the substituents on the silicon atoms in the siloxane fluid being hydrocarbon radicals containing 1 to 18 carbon atoms, 50 to 80 percent by weight of a mineral filler selected from the group consisting of clays, ground quartz, gypsum, silica and aluminum, and which also contains up to 6 percent by weight of a siloxane resin composed of SiO 2 and (CH 3 ) 3 SiO 1/2 units, the ratio of the SiO 2 units to the (CH 3 ) 3 SiO 1/2 units being in the range of 1:0.6 to 1:1.2.
Claim 3
Dependent Claim
45 words
A composition as defined in claim 1 wherein the siloxane fluid constitutes 35 to 45 percent, has a viscosity in the range of 350 to 1000 centistokes and the radicals contain from 1 to 6 carbon atoms, and the filler constitutes 55 to 65 percent.
Claim 4
Dependent Claim
35 words
A composition as defined in claim 2 wherein the radicals are selected from the group consisting of methyl and phenyl radicals, and the filler is selected from the group consisting of silica and aluminum oxide.
Claim 5
Dependent Claim
20 words
A composition as defined in claim 3 wherein all the radicals are methyl radicals, and the filler is aluminum oxide.
Claim 6
Dependent Claim
22 words
A composition as defined in claim 3 wherein the radicals are both methyl and phenyl radicals, and the filler is aluminum oxide.
Claim 7
Dependent Claim
25 words
A composition as defined in claim 3 wherein all the radicals are methyl radicals, and the filler is a combination of aluminum oxide and silica.
Claim 8
Dependent Claim
12 words
A composition as defined in claim 1 which also contains a solvent.
Claim 9
Dependent Claim
24 words
A composition as defined in claim 7 wherein the solvent is selected from the group consisting of non-aromatic hydrocarbon and non-aromatic halogenated hydrocarbon solvents.
References Cited (Backward Citations)
US2681859A
Cited
US2428608A
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US2550452A
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US2601337A
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US2645588A
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US3453210A
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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) | 1980-03-07 | 1980-09-06 | 1981-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-07 | 1984-09-06 | 1985-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-07 | 1988-09-06 | 1989-03-08 | $7700.00 | Window Closed / Lapsed |