Patents by Inventor Yoshihisa Nakanishi

Yoshihisa Nakanishi 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 determining the unhydration ratio of cement contained in cement sludge
    Patent number: 5237858
    Abstract: The present invention relates to a method and a system for recycling wash residue of ready mixed concrete include the steps of condensing used cement sludge to a predetermined concentration, storing the condensed sludge, sampling the stored sludge and determining the unhydration ratio of cement contained in the sludge, and weighing the stored sludge based on the determined unhydration ratio of cement in order to prepare a new batch of ready mixed concrete or mortar. By determining the unhydration ratio of cement contained in the sludge which has been condensed to a predetermined concentration, it becomes possible to accurately know the ratio of cement contributing as cement and its ratio contributing as the aggregate in a new batch of ready mixed concrete. A new batch of ready mixed concrete can be prepared by weighing the amount of the sludge on the basis of the determined unhydration ratio. The ready mixed concrete thus prepared will have a desired hardening strength and drying shrinkage.
    Type: Grant
    Filed: April 3, 1992
    Date of Patent: August 24, 1993
    Assignee: Neotec Co., Inc.
    Inventors: Yukio Ohsaki, Fumio Iwase, Yoshihisa Nakanishi
  • Method for recycling wash residue of ready mixed concrete and system therefor
    Patent number: 5209130
    Abstract: The present invention relates to a method and a system for recycling wash residue of ready mixed concrete include the steps of condensing used cement sludge to a predetermined concentration, storing the condensed sludge, sampling the stored sludge and determining the unhydration ratio of cement contained in the sludge, and weighing the stored sludge based on the determined unhydration ratio of cement in order to prepare a new batch of ready mixed concrete or motar. By determining the unhydration ratio of cement contained in the sludge which has been condensed to a predetermined concentration, it becomes possible to accurately know the ratio of cement contributing as cement and its ratio contributing as the aggregate in a new batch of ready mixed concrete. A new batch of ready mixed concrete can be prepared by weighing the amount of the sludge on the basis of the determined unhydration ratio. The ready mixed concrete thus prepared will have a desired hardening strength and drying shrinkage.
    Type: Grant
    Filed: August 11, 1992
    Date of Patent: May 11, 1993
    Assignee: Neotec Co., Ltd.
    Inventors: Yukio Ohsaki, Fumio Iwase, Yoshihisa Nakanishi
  • Method for recycling wash residue of ready mixed concrete and system therefor
    Patent number: 5178455
    Abstract: The present invention relates to a method and a system for recycling wash residue of ready mixed concrete include the steps of condensing used cement sludge to a predetermined concentration, storing the condensed sludge, sampling the stored sludge and determining the unhydration ratio of cement contained in the sludge, and weighing the stored sludge based on the determined unhydration ratio of cement in order to prepare a new batch of ready mixed concrete or mortar.By determining the unhydration ratio of cement contained in the sludge which has been condensed to a predetermined concentration, it becomes possible to accurately know the ratio of cement contributing as cement and its ratio contributing as the aggregate in a new batch of ready mixed concrete. A new batch of ready mixed concrete can be prepared by weighing the amount of the sludge on the basis of the determined unhydration ratio. The ready mixed concrete thus prepared will have a desired hardening strength and drying shrinkage.
    Type: Grant
    Filed: June 19, 1991
    Date of Patent: January 12, 1993
    Assignee: Neotec Co., Ltd.
    Inventors: Yukio Ohsaki, Fumio Iwase, Yoshihisa Nakanishi