Patents by Inventor Masahito Tanaka

Masahito Tanaka has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6293935
    Abstract: An absorbent article (1) comprising a liquid permeable top layer (10), a liquid impermeable back layer (20), and a liquid retentive absorbent member (30) interposed between the top layer (10) and the back layer (20), wherein the absorbent member (30) includes an absorbent sheet (31) having a thickness of 0.3 mm to 5 mm, the absorbent sheet being arranged such that a barrier cuff having a prescribed width is formed at the central portion of the top layer in the widthwise direction thereof, wherein said absorbent member is provided with liquid shrinkable members, which can elastically shrink upon the absorption of the liquid at the surface of said absorbent member facing said top layer and/or inside said absorbent member and in the vicinity of said surface, such that said absorbent member elastically shrinks over a prescribed length.
    Type: Grant
    Filed: January 13, 1999
    Date of Patent: September 25, 2001
    Assignee: Kao Corporation
    Inventors: Mayumi Kimura, Hironori Kawasaki, Masahito Tanaka, Mitsugu Hamajima, Minoru Nakanishi, Takao Nakayama
  • Patent number: 6159190
    Abstract: An absorbent article including a liquid-retentive absorptive layer formed on a liquid-impermeable, leak-preventive layer in a substantially elongated configuration, the absorbent layer including a liquid-permeable top sheet and a liquid-retentive absorbent member, and the absorbent article is provided longitudinally with left and right opposite side portions containing elastic members which extend in the longitudinal direction thereof, wherein the elastic members are covered with an elastic member-attached sheet provided on an inner surface side of the top sheet.
    Type: Grant
    Filed: August 19, 1998
    Date of Patent: December 12, 2000
    Assignee: KAO Corporation
    Inventors: Masahito Tanaka, Mitsugu Hamajima, Yoji Kameo, Takao Nakayama
  • Patent number: 5637105
    Abstract: An absorbent article having a liquid permeable topsheet, a liquid impermeable backsheet, an absorbent member interposed between the topsheet and backsheet, and a moisture absorbent material, wherein the amount of moisture absorption per unit area of the absorbent article is not less than 7.2.times.10.sup.-4 g/hr.cm.sup.2, and a total amount of moisture absorption of the absorbent article is not less than 0.10 g/hr in an environment of 35.degree. C./75% RH.
    Type: Grant
    Filed: June 20, 1994
    Date of Patent: June 10, 1997
    Assignee: Kao Corporation
    Inventors: Masahito Tanaka, Yayoi Fukuhara, Minoru Nakanishi
  • Patent number: 5236427
    Abstract: An absorbent article comprising a liquid permeable outer material, a liquid retentive absorbent article and a liquid-impermeable antileakage material, and formed in a substantially vertically elongated shape, wherein the absorbent element comprises a diffusing absorbent sheet and an absorbent retentive sheet positioned at the rear of the diffusing absorbent sheet and:(a) the diffusing absorbent sheet is a sheet having a hydrophilicity (cos .theta.) of 0.5 to 1 and a Klemm absorption velocity in the longitudinal direction of at least 40 mm/minute, and(b) the absorbent retentive sheet is a sheet comprising an aggregate of fibers having a capillary osmotic pressure of 4000 to 15000 dyne/cm.sup.2 and containing 10 to 100% by weight, based on the fiber aggregate, of a highly water-absorbent polymer having a physiological saline absorption of 40 to 70 g/g and a physiological saline absorption velocity of at least 2 ml/0.3 grams polymer.multidot.minute.
    Type: Grant
    Filed: August 1, 1991
    Date of Patent: August 17, 1993
    Assignee: KAO Corporation
    Inventors: Mitsugu Hamajima, Masahito Tanaka, Fumie Yanagida, Minoru Nakanishi