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:
Nov. 14, 1978
Filed:
Feb. 10, 1977
Haruyuki Ueno, Kitakyushu, JP;
Kurosaki Refractories Co., Ltd., Fukuoka, JP;
Abstract
This invention relates to dense structure refractories having heterogeneous structure and resistance to spalling whose heterogeneous structure is composed of major high density areas of (1) coarse and intermediate grains of secondary particulate and minor low density areas of (2) fine grains and fine powders of secondary particulate distributed in a zigzag random way at the boundaries between the coarse and intermediate grains, which are fabricated from an overall batch mixture consisting of more than 60% by weight of particles of secondary particulate larger than 0.5 mm and less than 40% by weight of particles of secondary particulate smaller than 0.5 mm in size.