High voltage insulating materials
Patent 4001128 Issued on January 4, 1977. Estimated Expiration Date: 
January 4, 1994. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
January 4, 1994. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2768264 2897173 3042743 InventorAssigneeApplicationNo. 274110 filed on 07/21/1972US Classes:524/263, Halogen174/110SR, Synthetic resin174/137B, Compositions524/265, Oxygen atom other than as Si-O-Si and at least one Si-C or Si-H group524/430, A single type of metal atom and only oxygen atoms DNRM, e.g., metal oxide, etc.524/492Mixing inorganic silicon-containing material having color or numerical limitations other than amount, e.g., included herein are m.p., chemical composition, particle size, surface area, etc., or composition or product thereof, DNRMExaminersPrimary: Welsh, John D.Attorney, Agent or FirmAbstractA filler system for polymers is disclosed which provides high voltage insulation which is resistant to tracking. The filler system utilizes a combination of alumina trihydrate and a chemically treated silica filler. The silica-treated filler results from the exposure of an inorganic silicon-containing filler having a specific surface area of at least 40 square meters per gram to one or more silanes. Preferred silanes are substituted silanes having the formula Rn Si X4-n where n is 1, 2 or 3, R is an organic radical bonded to the silicon atom by a Si--C bond and X is a radical bound to the silicon atom via an atom other than a carbon atom.Other References
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