Lightweight concrete roof tiles
January 9, 2005. 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 Re31682 3232777 3677686 3880664 Method for strengthening vitreous products and composition boards Shaped articles of hydraulic cement compositions with a glossy reflective surface and reinforced with fiber glass Compositions of cementitious mortar, grout and concrete Agglomerated volatilized silica dust Cementitious composite material with stainless steel particulate filler Rapid set lightweight cement product InventorsAssigneeApplicationNo. 06/689962 filed on 01/09/1985US Classes:106/726, Cellulose or silica containing (e.g., sand, etc.)106/678, Organic sulfur or organic phosphorus106/737Silica containing (e.g., sand, quartz, etc.)ExaminersPrimary: Dixon, William R. Jr.Assistant: Knab, A. Attorney, Agent or FirmInternational ClassesC04B 28/00 (20060101)C04B 28/02 (20060101) E04D 1/04 (20060101) E04D 1/02 (20060101) Foreign Application Priority Data1984-08-24 GBAbstractLightweight concrete roof tiles are produced by extruding a cement/lightweight aggregate/water mix containing a non-thixotropic silica fume in a weight ratio of silica fume (calculated as dry weight) to cement of about 2:98 to about 25:75, preferably about 8:92 to about 12:88. The presence of non-thixotropic silica fume in the mix enables lightweight roof tiles of adequate flexural strength to be obtained from the mix by extrusion. Novel cement/lightweight aggregate/water mixes containing non-thixotropic silica fume and novel roof tiles prepared therefrom are also described.Other References
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