Patents by Inventor Naoji Hasegawa

Naoji Hasegawa 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).

  • Air filter element and method of producing the same
    Patent number: 7083661
    Abstract: There is provided an air filter element which is used by fitting a central opening in its end plate on a cylindrical portion projecting into a casing, wherein the air filter element has a novel seal construction (end plate). An end plate (10) closing the end surface of a hollow cylindrical filter portion (2) includes a soft inner peripheral seal portion (11) capable of sticking to the outer surface of a cylindrical member (33) and a rigid closure portion (13) which is disposed on the outer periphery side of the inner peripheral seal portion and in which the end surface of the filter portion is embedded, the end plate being of composite construction in which the inner peripheral seal portion (11) and the closure portion (13) are integrally molded. On the outer periphery side of the inner peripheral seal portion (11), a groove (12) axially extending from an end surface (10a) of the end plate is formed along the opening.
    Type: Grant
    Filed: June 20, 2001
    Date of Patent: August 1, 2006
    Assignee: Toyo Element Industry Co., Ltd.
    Inventors: Naoji Hasegawa, Isamu Kawawa, Takayoshi Kuboyama
  • Air filter element and method of producing the same
    Publication number: 20040068970
    Abstract: There is provided an air filter element which is used by fitting a central opening in its end plate on a cylindrical portion projecting into a casing, wherein the air filter element has a novel seal construction (end plate). An end plate (10) closing the end surface of a hollow cylindrical filter portion (2) includes a soft inner peripheral seal portion (11) capable of sticking to the outer surface of a cylindrical member (33) and a rigid closure portion (13) which is disposed on the outer periphery side of the inner peripheral seal portion and in which the end surface of the filter portion is embedded, the end plate being of composite construction in which the inner peripheral seal portion (11) and the closure portion (13) are integrally molded. On the outer periphery side of the inner peripheral seal portion (11), a groove (12) axially extending from an end surface (10a) of the end plate is formed along the opening.
    Type: Application
    Filed: October 6, 2003
    Publication date: April 15, 2004
    Inventors: Naoji Hasegawa, Isamu Kawawa, Takayoshi Kuboyama