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. 02, 2025
Filed:
Aug. 05, 2021
Applicant:
Kohoku Kogyo Co., Ltd., Nagahama, JP;
Inventors:
Assignee:
KOHOKU KOGYO CO., LTD., Nagahama, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C03B 19/06 (2006.01); G02B 6/02 (2006.01);
U.S. Cl.
CPC ...
C03B 19/066 (2013.01); G02B 6/02042 (2013.01); C03B 2201/02 (2013.01); C03B 2203/14 (2013.01);
Abstract
A preform for optical fiber made of a quartz glass sintered body which is made from quartz glass powder as a main raw material, in which at least a portion of the quartz glass sintered body is an opaque body, the opaque body has a visible light transmittance of 90% or less at a length of 5 mm or less in one direction, and the opaque body has a bulk density of 2.1 g/cmor more, or the opaque body has a visible light transmittance of 90% or less at a length of 5 mm or less in one direction, and the opaque body has an open porosity of 3.5% or less.