Patents by Inventor Nobumasa Yokoi

Nobumasa Yokoi 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).

  • Novel .alpha.-1,6-glucosidase and process for producing the same
    Patent number: 4902622
    Abstract: A novel .alpha.-1,6-glucosidase having the following properties:(1) Action: The enzyme acts on an .alpha.-1,6-glucoside bond to produce linear amylose;(2) Substrate specificity: The enzyme has the following relative activity to polysaccharides:______________________________________ Polysaccharide Relative activity (%) ______________________________________ Pullulan 100 Maize soluble amylopectin 13.5 Soluble starch 6.7 Oyster glycogen 1.7 Hare glycogen 2.6 Maize amylopectin 3.8 Potato amylopectin 4.0 ______________________________________(3) Km value and Vmax to pullulan: the enzyme has Km value of 0.14 mg/ml and Vmax of 70.0 .mu.mol/min/mg protein;(4) Optimum pH: 5.0 to 5.5;(5) pH stability: The enzyme is stable in the pH range of 4.5 to 6.5 for 30 minutes at 40.degree. C. and in the pH range of 5.0 to 6.0 for 30 minutes at 50.degree. C.;(6) Optimum temperature: Approximately 55.degree. C.;(7) Thermal stability: Treatment at pH 4.
    Type: Grant
    Filed: September 25, 1987
    Date of Patent: February 20, 1990
    Assignee: Amano Pharmaceutical Co., Ltd.
    Inventors: Kuniharu Nakai, Masayoshi Shiozaki, Hiroji Tsuji, Shigeharu Mori, Susumu Hirose, Nobumasa Yokoi, Takaichi Ohya
  • Process for preparation of cellulase
    Patent number: 3983002
    Abstract: Aeromonas sp. No. 212 is cultured to allow it to produce a novel cellulase 212 and/or novel hemicellulase in a culture medium, and the so produced cellulase 212 and/or hemicellulase 333 is separated from the culture medium.The so separated novel cellulase 212 and/or novel hemicellulase 333 is used as a cellulosic material-decomposing agent in purifying tanks, plants for treatment of industrial waste waters, excrement treatment plants, drainage disposal treatment plants and the like.
    Type: Grant
    Filed: November 8, 1974
    Date of Patent: September 28, 1976
    Assignee: Amano Pharmaceutical Co., Ltd.
    Inventors: Takaichi Ohya, Nobumasa Yokoi, Tamio Mase