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:
Feb. 26, 1991
Filed:
Feb. 08, 1989
Kazuhiro Hasegawa, Chiba, JP;
Kawasaki Steel Corporation, Kobe, JP;
Abstract
A novel process for preparing spherical carbon microballoons is disclosed. In this process, a pitch is admixed with a low-boiling organic solvent to form a pitch-solvent mixture; the pitch-solvent mixture is pulverized and flash heated at a temperature higher than the boiling point of the low-boiling organic solvent to form hollow, spherical carbon microballoons; and the carbon microballoons are rendered infusible and then sintered. The formation of hollow, spherical carbon microballoons at high yield is enabled by using a particular pitch containing 40 to 65% by weight of benzene insoluble components and up to 0.1% by weight of quinoline insoluble components, and having a softening point in the range of 60.degree. to 320.degree. C.