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:
Jul. 16, 2002
Filed:
Jul. 20, 2000
Akihiko Sakamoto, Shiga, JP;
Masanori Wada, Otsu, JP;
Nippon Electric Glass Co., Ltd., Otsu, JP;
Abstract
In order to provide a tubular or a rod-like ceramic article which is opaque to a visible light and which enables easy and efficient measurement and inspection of its internal structure, the tubular or the rod-like ceramic article opaque to a visible light is made of an infrared transmitting ceramics having a transmittance not less than 45% for an infrared ray having a wavelength of 1500 nm and incident from the air when the thickness is equal to 1 mm. Preferably, the ceramic article is made of an infrared transmitting ceramics which satisfies the condition given by (1−R) ≧0.84 and &mgr;≦0.7/mm where R represents a reflectance at 1550 nm and &mgr; represents a sum of scattering coefficient and an absorption coefficient.