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:
Apr. 28, 1987
Filed:
Aug. 15, 1985
Donald I Thornton, Warwick, RI (US);
Clarke A Rodman, East Providence, RI (US);
Allied Corporation, Morristown, NJ (US);
Abstract
A fluid filter is formed by producing an air laid nonwoven batt comprising a randomly arranged mixture of thermoplastic fibers and fibers which are not thermoplastic. The batt is then cut into sections, and portions of the batt are heated to a temperature sufficient to partially fuse the fibers, thereby increasing the density of the portion of the batt which is heated. Accordingly, a gradient density filter may be produced having a progressively greater density from the fluid receiving side to the fluid expressing side, so that larger particles are trapped at the fluid receiving side and progressively smaller particles are trapped as the fluid flows through the media, with the finest particles being trapped at the fluid expressing side.