Boards and panels
Patent 4637860 Issued on January 20, 1987. Estimated Expiration Date: 
August 27, 2004. 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.
August 27, 2004. 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 1433864 1944895 2011440 3645961 Improvements in and relating to board products Building board Reinforced cement sheet product containing fibers other than asbestos, clay and thickener Patent #: 4363666 InventorsAssigneeApplicationNo. 06/644160 filed on 08/27/1984US Classes:162/117, Subsequent treatment by irregular or configured die162/145, Mineral162/146, Synthetic (including chemically modified cellulose)162/177, Cellulose derivative (e.g., cellulose ester)162/181.1, Inorganic162/181.6, Silicon containing additive other than clay162/181.8, Clay264/316, Utilizing sheet-like material264/333, Inorganic hydraulic settable material shaping264/82REACTIVE GAS OR VAPOR TREATMENT OF WORKExaminersPrimary: Chin, PeterAttorney, Agent or FirmInternational ClassesC04B 28/04 (20060101)C04B 28/00 (20060101) Foreign Application Priority Data1981-06-19 GBAbstractA process for the manufacture of a non-asbestos corrugated sheet comprising forming into corrugated form an aqueous slurry of a mixture comprising, on a dry weight basis, 40-60% cement, 30-40% silica and 5-15% cellulose fibres, compressing said corrugated form so produced in a press to reduce its thickness and increase its density, removing said form from said press and submitting said form to autoclaving to cause reaction to occur between said cement and said silica to form a binder matrix. The aqueous slurry may include a moldability aid such as finely divided silica, and the corrugated forms are suitably compressed individually and then passed through a steam tunnel partially to harden them before autoclaving. In corrugated sheets formed are suitable for external cladding and roofing. | |
