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:
Jun. 13, 2000
Filed:
Oct. 30, 1998
Toshikazu Tomura, Ichihara, JP;
Tomoyoshi Murakami, Ichiharashi, JP;
Idemitsu Petrochemical Co., Ltd., Tokyo, JP;
Abstract
Provided is a filter favorably used in high-temperature long-term exposure conditions, for example, in coal boilers, cupola furnaces for steel and cast iron production, cement kilns, aggregate drying furnaces, furnaces for non-iron metals, etc. For the filter, provided are a filter material comprising a web or a web and its support, which contains a polycyanoaryl ether in an amount of not smaller than 5% by weight relative to the weight of the filter material; and a filter material comprising a substrate of polycyanoaryl ether fibers or of polycyanoaryl ether fibers and other organic fibers, and a web of at least one type of fibers selected from polycyanoaryl ether fibers and other organic fibers, wherein the amount of the polycyanoaryl ether fibers is not smaller than 5% by weight relative to the total weight of the substrate and the web.