Method for preparing spherular silica gel particles
Patent 5589150 Issued on December 31, 1996. Estimated Expiration Date: 
December 31, 2013. 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.
December 31, 2013. 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 3501269 3607777 Method of selectively producing high pore volume silica gel Process for the preparation of precipitated silicas having morphology similar to pyrogenic silicas Process for the preparation of silica spheres Process for manufacturing high purity silica Method of manufacturing spherical silica particles Patent #: 5028360 InventorsAssigneeApplicationNo. 845528 filed on 03/04/1992US Classes:423/338, By gelling423/339By precipitatingExaminersPrimary: Niebling, John F.Attorney, Agent or FirmForeign Patent References
International ClassC01B 033/12AbstractIn the present invention, minute spherular silica gel particles suitable as polymer catalyst carriers can easily be obtained without using organic substances simply by controlling the moisture content in a slurry of silica hydrogel particles and water. The obtained spherular silica gel particles have physical properties, such as specific surface area, average pore diameter, and pore volume, that may be easily controlled. The spherular silica gel particles also have sufficient particle strength.Other References
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