Patents by Inventor Hirohito Iwawaki

Hirohito Iwawaki 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 of evaluating corrosion resistance of material under ammonium bisulfide environment
    Patent number: 7585677
    Abstract: It is an object to establish a test method that enables a high-concentration ammonium bisulfide environment to be reproduced at a laboratory level, and enables the corrosivity of a material to be evaluated easily and highly accurately. According to the test method, when evaluating the corrosion resistance of a material under an ammonium bisulfide environment, the corrosion resistance of the material is evaluated by simulating the relationship between the ammonium bisulfide concentration of a test solution and the pressure in advance, and then determining the ammonium bisulfide concentration from the pressure.
    Type: Grant
    Filed: October 11, 2005
    Date of Patent: September 8, 2009
    Assignees: Petroleum Energy Center, Toyo Engineering Corp.
    Inventor: Hirohito Iwawaki
  • Method of evaluating corrosion resistance of material under ammonium bisulfide environment
    Publication number: 20060217895
    Abstract: It is an object to establish a test method that enables a high-concentration ammonium bisulfide environment to be reproduced at a laboratory level, and enables the corrosivity of a material to be evaluated easily and highly accurately. According to the test method, when evaluating the corrosion resistance of a material under anammonium bisulfide environment, the corrosion resistance of the material is evaluated by simulating the relationship between the ammonium bisulfide concentration of a test solution and the pressure in advance, and then determining the ammonium bisulfide concentration from the pressure.
    Type: Application
    Filed: October 11, 2005
    Publication date: September 28, 2006
    Inventor: Hirohito Iwawaki