Nippondenso Co., Ltd.

Nippon Soken, Inc.

Atushi Kosaka

Kunio Okamoto

Toshihiro Takahara

Yoshihisa Sanami

Makoto Takemura

Sojiro Tsuchiya

Takeharu Maekawa

Toshihiko Murase

Masahito Sugiura

Minoru Hatano

Makoto Suzuki

Naohisa Ohyama

Satoru Kadowaki

A filter element for use in an oil filter is composed of main fibers of at least 5 .mu.m diameter and micro fibers of less than 5 .mu.m diameter. The micro fibers are filled in a density of 0.005 to 0.02 g/cm.sup.3. A slurry including the fibers is drawn into a suction unit through suction openings to form a molded body. The filter element is given a density gradient such that the micro fibers are denser in the inner periphery than in the outer periphery. Following the drawing step, the molded body together with the inner mold is removed for subsequent dehydration and heating. During those processes the inner mold is kept located within the molded body.

Filter element and fabrication method for the same

Disclosed is an active carbon for deodorization, which comprises a deodorizing functional group fixed to a graphitic six-membered ring on the surface of the active carbon, through a silanol bond.

Active carbon for deodorization and process for preparation thereof

Molecular sieve carbon fibers capable of separating and purifying nitrogen from air in large quantities are provided. The carbon fibers have diameters of 5 to 50 .mu.m and micropores opening directly at the surface of the carbon fibers with pore sizes of 0.5 nm or less. They are capable of separating nitrogen at a purity of 98% or higher, even 99.9% or higher from air, etc., with a relatively low adsorbing pressure and deadsorbing vacuum. The molecular sieve carbon fibers do not deteriorate during operation since they are resistant to division or powdering and the adsorbing pressure and deadsorbing vacuum are relatively low.

Process for producing molecular sieve carbon fibers

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Okazaki, Japan

Atushi Kosaka