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:
Sep. 29, 2026
Filed:
Jan. 26, 2023
Nippon Electric Glass Co., Ltd., Shiga, JP;
NIPPON ELECTRIC GLASS CO., LTD., Shiga, JP;
Abstract
A capillary includes a capillary main body made of glass and formed in an elongated shape. The capillary main body includes an accommodating portion configured to accommodate a part of an optical fiber. The accommodating portion includes an opening portion, which is formed in a first end surface of the capillary main body and is configured to allow insertion of the optical fiber. The capillary main body includes a compressive stress layer, which is formed on an opening portion and is observable by a two-dimensional birefringence measurement method, a tensile stress layer, which is formed at a position away from the compressive stress layer toward a second end surface of the capillary main body and is observable by the two-dimensional birefringence measurement method and a stress-neutral layer, which is formed between the compressive stress layer and the tensile stress layer and is observable by the two-dimensional birefringence measurement method.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile