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. 18, 2023
Filed:
Feb. 19, 2019
Shin-etsu Quartz Products Co., Ltd., Tokyo, JP;
Yuji Baba, Echizen, JP;
SHIN-ETSU QUARTZ PRODUCTS CO., LTD., Tokyo, JP;
Abstract
A quartz glass crucible including bottom, curved, and straight body portions, where the quartz glass crucible includes an outer layer including opaque quartz glass containing bubbles, and an inner layer including transparent quartz glass, the outer layer fabricated from different types of raw material powder, the outer layer having regions sectioned by bubble content densities, and bubble content densities of two outer layer adjacent regions, when d(pcs/mm) is defined as content density of a region 'a' having a greater content density, and d(pcs/mm) is defined as content density of a region 'b' having a smaller content density, a difference D=(d−d)/dbetween content densities of the two regions is 10% or more.