The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 26, 2013
Filed:
Aug. 24, 2012
Yasutaka Ohshima, Tokyo, JP;
Isamu Hirano, Tokyo, JP;
Takayuki Higuchi, Tokyo, JP;
Denki Kagaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A process for producing the alumina fiber aggregate which, when examined by the electron microscope method, gives a frequency distribution regarding number of fibers, wherein the number of fibers having a fiber length of 50-200 μm is 70% or more (including 100%), the number of fibers having a fiber length smaller than 50 μm is 30% or less (including 0), the number of fibers of 50-100 μm is 30-50%, the number of fibers longer than 100 μm but not longer than 200 μm is 30-50%, and the number of fibers longer than 200 μm is 20% or less (including 0). The process including the steps of grinding cottony alumina-based fibers comprising 70-100% by mass of AlOand 0-30% by mass of SiOwhile applying a pressure of 0.1-20 MPa thereto and then classifying the ground fibers.