Method for manufacturing heat-cured molded articles from cement
Patent 4125497 Issued on November 14, 1978. Estimated Expiration Date: 
May 27, 1996. 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.
May 27, 1996. 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 2770840 2859192 3075935 3437619 3865779 Mortar of inorganic binder and sulfonic acid group-containing formaldehyde condensation product with cycloalkanone Concrete treating composition Patent #: 3981834 InventorsAssigneeApplicationNo. 05/690443 filed on 05/27/1976US Classes:524/4, Solid polymer or specified intermediate condensation product derived from at least one oxygen-containing reactant and which is devoid of a fused ring or bridged ring system264/333Inorganic hydraulic settable material shapingExaminersPrimary: Woo, Jay H.Attorney, Agent or FirmInternational ClassesC04B 28/00 (20060101)C04B 28/02 (20060101) Foreign Application Priority Data1975-05-31 DEAbstractAn improved method of manufacturing shaped objects from cement wherein cement is wetted with an aqueous solution of an acetone-formaldehyde resin, optionally including a water-soluble alcohol, the wet mixture molded to the desired shape and then cured preferably at a temperature within the range of 30° C to 100° C, wherein the bending strength of the finished product is improved by incorporating a metal soap in the composite prior to molding the wet mixture.Also disclosed is an improved composition of matter comprising Portland cement, an acetone-formaldehyde resin and a metal soap, and optionally containing an inorganic aggregate.Other References
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