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. 17, 1990
Filed:
Jan. 14, 1988
Akihiro Kunimoto, Ube, JP;
Noboru Umemoto, Kuwana, JP;
UBE Industries, Ltd., Ube, JP;
NTN-Rulon Industries, Co., Ltd., Tokyo, JP;
Abstract
A method of continuously forming a shaped long article of an aromatic polyimide power including supplying a powdery mixture containing an aromatic polyimide powder having a heat loss ratio of not more than 2 wt. % and a mean particle size in the range of 0.1 to 40 .mu.m, and a small amount of a fluororesin powder to a ram-extrusion apparatus having a mold and performing alternately, at a temperature of not lower than 300.degree. C., filling the mold with the above mixture and ram-extruding the same at a pressure in the range of 100-1,500 kg/cm.sup.2. An extruded long article of an aromatic polyimide which has a specific gravity of more than 1.380, a radial crushing strength of not less than 800 kg/cm.sup.2, and a coefficient of linear expansion in the radial direction being less than that in the longitudinal direction.