Patents by Inventor Toshiro Iwama

Toshiro Iwama 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).

  • Sludge treating method
    Patent number: 4559143
    Abstract: The present invention relates to a method for the treatment of sludges such as sewage sludges, night soils, water supply sludges, sludged deposition in bottoms of rivers, lakes, harbors and seas and industrial waste water sludges. According to this method, a fiber in an amount of 0.05 to 20% by weight based on solids in a sludge to be treated and an inorganic coagulant or polymeric coagulant are added to the sludge to coagulate the sludge, and water is removed from the coagulated sludge to obtain a filter cake having a low water content.
    Type: Grant
    Filed: January 27, 1982
    Date of Patent: December 17, 1985
    Assignee: Nichikeri Chemical Industry Co. Ltd.
    Inventors: Hiroshi Asada, Kohei Kobayashi, Toshiro Iwama