Patents by Inventor Tomoaki Katsumata

Tomoaki Katsumata 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).

  • Method for forming phosphate film on the steel wires and apparatus used therefore
    Patent number: 6235180
    Abstract: Method and appartus suitable for forming promptly a phosphate film of excellent performance for cold drawing on the steel wires are disclosed. The steel wires are descaled by cathodic electrolysis in acid solution, and thereafter, phosphate film are formed by cathodic electrolysis on the steel wires. Contacting with the solution containing colloidal titanium are preferable to be carried out between cathodic descaling process and phosphate film forming process. Descaling of cathodic electrolysis may preferably be performed in acid solution at a temperature of lower than 90° C. and in 1˜100 A/dm2. Phosphate film forming may preferably be performed by using electrolyte containing Zn ion, phosphoric acid ion and nitric acid ion, at a temperature of lower than 90° C., in 1˜100 A/dm2 and for 1˜30 seconds.
    Type: Grant
    Filed: June 30, 1999
    Date of Patent: May 22, 2001
    Assignees: Nihon Parkerizing Co., Ltd., Fujisyouji Kabushikigaisha
    Inventors: Naoyuki Kobayashi, Atsushi Moriyama, Shigemasa Takagi, Tomoaki Katsumata