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:
Apr. 17, 1989
Applicant:
Inventors:
Seiichirou Takabayashi, Ube, JP;
Masaki Egami, Yokkaichi, JP;
Assignees:
UBE Industries, Ltd., Ube, JP;
NTN-Rulon Industries, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B32B / ;
U.S. Cl.
CPC ...
428401 ; 4284735 ; 521919 ;
Abstract
An extruded porous article, which can be prepared by a ram-extruding method, comprising an aggregated aromatic polyimide powder which has a heat loss ratio of not more than 2 wt. %, the heat loss ratio being measured at 360.degree. C. for 1 hour, and a mean particle size in the range of 1 to 40 .mu.m, wherein pores are distributed essentially uniformly in the article, and its porosity is in the range of 5-20%, the porosity % being defined by the formula: ##EQU1##