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:
Apr. 09, 2019
Filed:
Aug. 25, 2015
Nippon Steel & Sumikin Materials Co., Ltd., Tokyo, JP;
Yutaka Sato, Tokyo, JP;
Katsumasa Yagi, Himeji, JP;
Mutsuhito Tanaka, Himeji, JP;
Shozo Tokuda, Himeji, JP;
Masanori Ae, Himeji, JP;
NIPPON STEEL & SUMIKIN MATERIALS CO., LTD., Tokyo, JP;
Abstract
Spherical crystalline silica particles having a higher productivity, lower production cost, higher coefficient of thermal expansion, higher heat transmission rate, higher fluidity, higher dispersability, higher fill factor, low abrasiveness, and higher purity compared with the past and able to be applied in the semiconductor field and a process of production of the same are provided. Spherical crystalline silica particles containing 400 to 5000 ppm of aluminum and containing 80% or more of crystal phases are provided.