Patents by Inventor Buichiro Ayukawa

Buichiro Ayukawa 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 purification of waste water by treatment with zirconium salt
    Patent number: 4097377
    Abstract: The present invention relates to a method of purification of waste water from chemical pulping and paper mills comprising coagulation and precipitation of suspended substances and colloidal dispersed particles, precipitation of non-colloidal dissolved, low molecular weight substances in the waste water and formation of water insoluble precipitates or chelates thereof, and further to a method of purification of waste water of any source of the use of zirconium salt.
    Type: Grant
    Filed: December 22, 1975
    Date of Patent: June 27, 1978
    Assignee: Shikoku Paper Mfg. Co., Ltd.
    Inventor: Buichiro Ayukawa
  • Method of purification of waste water by treatment with zirconium salt
    Patent number: 4066542
    Abstract: The present invention refers to a method of purification of waste water from chemical pulping and paper mills comprising coagulate and precipitate suspended substances and colloidal dispersed particles, and precipitation of non-colloidal dissolved, low molecular weight substances in the waste water and form water insoluble precipitates or chelates thereof, and further to a method of purification of waste water of any source by the use of zirconium salt.
    Type: Grant
    Filed: August 9, 1976
    Date of Patent: January 3, 1978
    Assignee: Shikoku Paper Mfg. Co., Ltd.
    Inventor: Buichiro Ayukawa
  • Method of purification of waste water by treatment with zirconium salt
    Patent number: 3997439
    Abstract: The present invention relates to a method of purification of waste water from chemical pulping and paper mills comprising coagulation and precipitation of suspended substances and colloidal dispersed particles, precipitation of non-colloidal dissolved, low molecular weight substances in the waste water and formation of water insoluble precipitates or chelates thereof, and further to a method of purification of waste water of any source by the use of zirconium salt.
    Type: Grant
    Filed: November 1, 1974
    Date of Patent: December 14, 1976
    Assignee: Shikoku Paper Mfg. Co., Ltd.
    Inventor: Buichiro Ayukawa