Patents by Inventor Sadao Umezawa

Sadao Umezawa 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: 6740606
    Abstract: A laminated sheet having electromagnetic wave shielding effects and a manufacturing method therefor are provided wherein the laminated sheet is transparent, has electromagnetic wave shielding effects and is easily manufactured, moreover, an earthing terminal can be easily connected to the laminated sheet, and post-processing such as ultrasonic adhesion and the like can be easily conducted on the laminated sheet. In the manufacturing method, a conductive mesh-like sheet and a thermoplastic resin sheet are positioned between two molding plates and heated, these sheets are integrally laminated by means of the application of pressure between molding plates. In addition, as the above-mentioned thermoplastic resin sheet, a thermoplastic resin sheet having at least one resin layer which has a thickness which is two times or greater than the thickness of the conductive mesh-like sheet and which has uniform thermal properties is used.
    Type: Grant
    Filed: April 17, 2002
    Date of Patent: May 25, 2004
    Assignees: Shoritsu Plastics Ind. Co., Ltd., Kuraray Co., Ltd.
    Inventors: Sadao Umezawa, Kihachiro Ishiguro, Akira Hiruma, Kunihiko Ogawa, Yoshikane Takagi
  • Patent number: 6552481
    Abstract: A color CRT suppresses deformation of the main shadow mask surface after fastening the shadow mask to the mask frame. Numerous substantially rectangular grooves or substantially circular recesses are formed in the damper part disposed to the shadow mask skirt so that the bending strength in the circumference direction of the skirt is greater than the bending strength in the direction parallel to the tube axis.
    Type: Grant
    Filed: January 4, 2001
    Date of Patent: April 22, 2003
    Assignee: Hitachi Ltd.
    Inventors: Takeharu Furusawa, Nobuhiko Hosotani, Sadao Umezawa
  • Publication number: 20020108704
    Abstract: A laminated sheet having electromagnetic wave shielding effects and a manufacturing method therefor are provided wherein the laminated sheet is transparent, has electromagnetic wave shielding effects and is easily manufactured, moreover, an earthing terminal can be easily connected to the laminated sheet, and post-processing such as ultrasonic adhesion and the like can be easily conducted on the laminated sheet.
    Type: Application
    Filed: April 17, 2002
    Publication date: August 15, 2002
    Applicant: SHORITSU PLASTICS IND. CO., LTD.
    Inventors: Sadao Umezawa, Kihachiro Ishiguro, Akira Hiruma, Kunihiko Ogawa, Yoshikane Takagi
  • Patent number: 6398899
    Abstract: A laminated sheet having electromagnetic wave shielding effects and a manufacturing method therefor are provided wherein the laminated sheet is transparent, has electromagnetic wave shielding effects and is easily manufactured, moreover, an earthing terminal can be easily connected to the laminated sheet, and post-processing such as ultrasonic adhesion and the like can be easily conducted on the laminated sheet.
    Type: Grant
    Filed: January 22, 1998
    Date of Patent: June 4, 2002
    Assignees: Shoritsu Plastics Ind. Co., Ltd., Kuraray Co., Ltd.
    Inventors: Sadao Umezawa, Kihachiro Ishiguro, Akira Hiruma, Kunihiko Ogawa, Yoshikane Takagi
  • Publication number: 20010007408
    Abstract: A color CRT suppresses deformation of the main shadow mask surface after fastening the shadow mask to the mask frame. Numerous substantially rectangular grooves or substantially circular recesses are formed in the damper part disposed to the shadow mask skirt so that the bending strength in the circumference direction of the skirt is greater than the bending strength in the direction parallel to the tube axis.
    Type: Application
    Filed: January 4, 2001
    Publication date: July 12, 2001
    Inventors: Takeharu Furusawa, Nobuhiko Hosotani, Sadao Umezawa
  • Patent number: 4875170
    Abstract: The life expectancy of a mechanical structure that undergoes repeated loading is estimated by determining the maximum crack length on the surface of the structure. The maximum length of the cracks on the surface of the structure is related to the life ratio of the structure, wherein the life ratio is a ratio of the number of loads the structure has undergone to the number of loads the structure will undergo until failure. An optical system is used to measure the crack length of the cracks on the surface of the structure being inspected. A statistical distribution of greatest length cracks for a sampling of areas within a larger area can be made. Apparatus is provided to statistically process such distribution data to obtain a statistically estimated maximum length crack for the larger area. The maximum crack length determination can be used to estimate the life expectancy of the structure from the relationship between crack length and life ratio.
    Type: Grant
    Filed: May 31, 1988
    Date of Patent: October 17, 1989
    Assignee: Hitachi, Ltd.
    Inventors: Shigeo Sakurai, Sadao Umezawa, Saburo Usami, Hiroshi Miyata, Hajime Toriya, Kuniyoshi Tsubouchi, Ryoichi Kaneko
  • Patent number: 4786233
    Abstract: The penetrating members (21, 35, 37, 38, 39) are disposed inside the cooling passage (8) at positions so as to penetrate through the cooling passage (8), and have both of ends thereof fixed to the rear side wall (17) and the body side wall (18). The projecting members (33) (34A, 34B) are disposed inside the cooling passage (8) so as to project from the rear side wall (17) or the body side wall (18). The rectification ribs (36) are disposed at intermediate positions between the penetrating members (21, 35, 37, 38, 39) or the projecting members (33, 34A, 34B). The penetrating members (21, 35, 37, 38, 39) or the projecting members (33, 34A, 34B) disturbs the main stream (3a) of the cooling fluid (3) near the internal partition (19) in both directions of the leading edge wall (16) and the first internal partition (19) and make the main stream (3a ) non-uniformly or causes its channelling.
    Type: Grant
    Filed: January 20, 1987
    Date of Patent: November 22, 1988
    Assignee: Hitachi, Ltd.
    Inventors: Mitsutaka Shizuya, Kazuhiko Kawaike, Sadao Umezawa, Katsuo Wada, Nobuyuki Iizuka, Tomo Sato