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:
Mar. 12, 2024
Filed:
Mar. 25, 2019
Shin-etsu Quartz Products Co., Ltd., Tokyo, JP;
Tatsuya Mori, Koriyama, JP;
Akira Sato, Koriyama, JP;
Atsushi Shimada, Sasebo, JP;
Yuya Yokosawa, Koriyama, JP;
Nobumasa Yoshida, Koriyama, JP;
SHIN-ETSU QUARTZ PRODUCTS CO., LTD., Tokyo, JP;
Abstract
A quartz glass plate has a quartz glass plate body and a quartz glass member adhered to the quartz glass plate body through an adhesive layer, where the adhesive layer contains silica, and a sum of concentrations of Li, Na, and K ions, being alkali metal ions and Ca ions, being alkaline earth metal ions contained in the adhesive layer is 10 ppm by mass or less. Consequently, a step with a uniform thickness can be formed, and a quartz glass plate is not easily damaged by irradiation with a light containing an ultraviolet ray.