Patents by Inventor Minoru Ieda

Minoru Ieda 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).

  • Process for the production of highly concentrated phosphoric acid
    Patent number: 4797265
    Abstract: A process for the production of highly concentrated phosphoric acid, comprises improvements in digesting phosphate rock with a mixed acid consisting essentially of sulfuric acid and phosphoric acid to obtain a slurry comprising phosphoric acid and hemihydrate (CaSO.sub.4.1/2H.sub.2 O), then filtering the slurry, taking out highly concentrated phosphoric acid as product acid and subsequently hydrating the hemihydrate to obtain gypsum (dihydrate: CaSO.sub.4.2H.sub.2 O).
    Type: Grant
    Filed: March 12, 1987
    Date of Patent: January 10, 1989
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Tadashi Inoue, Akira Ohkoba, Kunio Sakashita, Akira Utsunomiya, Takeki Shinozaki, Minoru Ieda