Patents by Inventor Shigenobu Fujioka

Shigenobu Fujioka 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).

  • Slump reduction-preventing agent and method for improving applicability of mortar concrete
    Patent number: 4367094
    Abstract: An agent for preventing deterioration in the slump properties of mortar concrete, containing as a main ingredient a lignin sulfonate having a carboxyl group content of at least 0.2 mols and a sulfon group content of at least 0.1 mols per phenyl propane unit. Disclosed is also a method for improving the workability of mortar concrete, comprising adding said agent to the mortar concrete in an amount of 0.05 to 0.5% in relation to cement and at any suitable point of time before or after mixing.
    Type: Grant
    Filed: June 16, 1980
    Date of Patent: January 4, 1983
    Assignee: Sanyo-Kokusaku Pulp Co., Ltd.
    Inventors: Yukio Fujimaru, Toshihiro Sugiwaki, Keiji Ueoka, Shigenobu Fujioka