Patents by Inventor Osamu Umekawa

Osamu Umekawa 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).

  • Stable biocide composition for industrial use
    Patent number: 5017592
    Abstract: A stable biocide composition for industrial use which comprises 4,5-dichloro-1,2-dithiol-3-one and a mixture of 5-chloro-2- methyl-3-isothiazolone and 2-methyl-3-isothiazolone, together with a substantially anhydrous organic solvent for dissolving said ingredients.
    Type: Grant
    Filed: November 30, 1989
    Date of Patent: May 21, 1991
    Inventor: Osamu Umekawa
  • Microbicidal/microbistatic compositions for industrial use employing 4,5-dichloro-1,2-dithiol-3-one and haloacetic acid esters as the active agents
    Patent number: 4647577
    Abstract: This invention relates to microbicidal/microbistatic compositions for industrial use which comprise 4,5-dichloro-1,2-dithiol-3-one and a haloacetic acid ester and an industrial method of killing and/or inhibiting microbes by using the aforementioned compositions.
    Type: Grant
    Filed: December 20, 1985
    Date of Patent: March 3, 1987
    Assignees: Katayama Chemical Works Co., Ltd., Yoshitomi Pharmaceutical Ind., Ltd.
    Inventors: Osamu Umekawa, Sakae Katayama
  • Microbicidal/microbistatic compositions and use thereof employing mixtures of 4,5-dichloro-1,2-dithiol-3-one and alkylenebisthiocyanate
    Patent number: 4518610
    Abstract: This invention relates to microbicidal/microbistatic compositions for industrial use which comprise 4,5-dichloro-1,2-dithiol-3-one and an alkylenebisthiocyanate and a method of killing and/or inhibiting the growth of microbes by using the aforementioned compositions.
    Type: Grant
    Filed: December 3, 1981
    Date of Patent: May 21, 1985
    Assignees: Katayama Chemical Works Co., Ltd., Yoshitomi Pharmaceutical Industries, Ltd.
    Inventors: Osamu Umekawa, Sakae Katayama
  • Microbicidal/microbistatic compositions for industrial use
    Patent number: 4466975
    Abstract: A microbicidal/microbistatic compositions for industrial use, which comprises 4,5-dichloro-1,2-dithiol-3-one and 1,2-benzisothiazolin-3-one, and a method of killing or inhibiting the growth of microbes, which comprises adding 4,5-dichloro-1,2-dithiol-3-one and 1,2-benzisothiazolin-3-one simultaneously or at intervals to a system to be controlled microbicidally/microbistatically.
    Type: Grant
    Filed: April 2, 1982
    Date of Patent: August 21, 1984
    Assignees: Yoshitomi Pharmaceutical Industries, Ltd., Katayama Chemical Works Co., Ltd.
    Inventors: Masato Magami, Toshio Sato, Sakae Katayama, Osamu Umekawa
  • Easily dispersible composition for water soluble polymer
    Patent number: 4409353
    Abstract: An easily dispersible polymer composition which comprises a powder of a water soluble polymer having floculating property and a sodium sulfate hydrate, and optionally a magnesium sulfate hydrate and a hydroscopic agent and which shows a high degree of granularity and free-fluidity.
    Type: Grant
    Filed: June 29, 1982
    Date of Patent: October 11, 1983
    Assignee: Katayama Chemical Works Co., Ltd.
    Inventors: Osamu Umekawa, Yosuke Ito, Sakae Katayama
  • Microbicidal compositions for industrial use
    Patent number: 4334957
    Abstract: There disclose stable and non-aqueous microbicidal compositions which are useful for controlling slime in pulp and paper manufacturing processes and industrial cooling water systems and which comprise 4,5-dichloro-1,2-dithiol-3-one as the active ingredient, and specific surfactants and hydrophilic organic solvents.
    Type: Grant
    Filed: July 29, 1980
    Date of Patent: June 15, 1982
    Assignees: Katayama Chemical Works Co. Ltd., Yoshitomi Pharmaceutical Industries Ltd.
    Inventors: Sakae Katayama, Osamu Umekawa
  • Microbicidal slimicide compositions for industrial use
    Patent number: 4289581
    Abstract: There disclose stable and non-aqueous microbicidal compositions which are useful for controlling slime in pulp and paper manufacturing processes and industrial cooling water systems and which comprise 4,5-dichloro-1,2-dithiol-3-one as the active ingredient, and specific surfactants and hydrophilic organic solvents.
    Type: Grant
    Filed: March 23, 1979
    Date of Patent: September 15, 1981
    Assignee: Katayama Chemical Works Co., Ltd.
    Inventors: Sakae Katayama, Osamu Umekawa