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:
Mar. 14, 1995
Filed:
May. 14, 1993
William F Murphy, Jr, Wilmington, DE (US);
Randy E Powell, Mount Juliet, TN (US);
Reemay, Inc., Old Hickory, TN (US);
Abstract
An improved nonwoven multi-layered composite article is provided that is well amenable to pleating and service as a depth gaseous filtration medium. The components utilized to form the multi-layered composite consist essentially of polyester continuous filaments and staple fibers (as described in detail hereafter) and are mechanically secured together by needle-punching. At least one surface is lightly resin coated following the needle-punching in order to impart additional stiffness to the overall nonwoven laminated composite. The resulting article is capable of readily undergoing pleating to form a pleated filtration medium. In a preferred embodiment the resulting composite is free of any component that is capable of substantial moisture retention thereby enhancing the stability and shape retention properties of the product over a broader range of operating conditions. Additionally, in a preferred embodiment an outer surface of the composite article has been subjected to a heat relaxation treatment prior to resin coating in order to reduce the size of needle holes and to enhance the particle arrestance and dust holding capacity of resulting article.