Patents by Inventor Tokuzo Nakagawa

Tokuzo Nakagawa 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: 5916266
    Abstract: A raw membrane material having an acellular nature and consisting substantially of a compact layer whose characteristic matrix structure is retained intact and which is produced by dissolving and removing cellular layers including epithelium and fibroblast layers from a biogenic, connective tissue membrane which comprises epithelial, basement membrane, compact and fibroblast layer.
    Type: Grant
    Filed: September 15, 1997
    Date of Patent: June 29, 1999
    Assignee: Bio-Engineering Laboratories, Ltd.
    Inventors: Tooru Yui, Tokuzo Nakagawa, Kazuo Kondoh
  • Patent number: 5876451
    Abstract: A medical device having stratum compactum of tissue membrane is provided. The present invention further provides a method for producing a medical device having stratum compactum of tissue membrane. The method includes the steps of: separating tissue membrane including stratum compactum from tissue; sterilizing or disinfecting the separated tissue membrane; and removing all other layers except the stratum compactum from the sterilized or disinfected tissue membrane using an enzyme.
    Type: Grant
    Filed: January 7, 1998
    Date of Patent: March 2, 1999
    Assignees: Toyo Boseki Kabushiki Kaisha, Bio-Engineering Laboratories, Ltd.
    Inventors: Tooru Yui, Tokuzo Nakagawa, Kazuo Kondo
  • Patent number: 5723010
    Abstract: A medical device consisting essentially of stratum compactum of tissue membrane is provided. The present invention further provides a method for producing a medical device consisting essentially of stratum compactum of tissue membrane. The method comprises the steps of: separating tissue membrane including stratum compactum from tissue; sterilizing or disinfecting the separated tissue membrane; and removing all other layers except the stratum compactum from the sterilized or disinfected tissue membrane using an enzyme.
    Type: Grant
    Filed: March 29, 1996
    Date of Patent: March 3, 1998
    Assignees: Toyo Boseki Kabushiki Kaisha, Bio-Engineering Laboratories, Ltd.
    Inventors: Tooru Yui, Tokuzo Nakagawa, Kazuo Kondo
  • Patent number: 5618312
    Abstract: Disclosed are a medical material and a production process thereof. The medical material has a membrane configuration and is produced by impregnating a membranous material with collagen or gelatin and then physically or chemically cross-linking protein molecules of the membranous material. The membranous material is essentially acellular compact layer of a biogenic connective tissue. The medical material may further be processed into other forms such as threads, braids, tubes and hoses and is useful in surgery. The medical material has a strength sufficient to be useful for surgically stitching wounds either manually or mechanically.
    Type: Grant
    Filed: April 12, 1996
    Date of Patent: April 8, 1997
    Assignee: Bio-Engineering Laboratories, Ltd.
    Inventors: Tooru Yui, Tokuzo Nakagawa, Kazuo Kondoh