Patents by Inventor Sei-ichi Yokoi

Sei-ichi Yokoi 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).

  • Water-based, water-fast ink compositions containing a binder matrix of a monomeric polyacid and a monomeric polybase
    Patent number: 6117222
    Abstract: Water-based, water-fast ink compositions are provided. The compositions contain an aqueous liquid vehicle, a colorant, e.g., a pigment, dye or stain, and a binder material capable of ionically or physically entrapping the selected colorant. The binder material contains two ionically associated components which form a matrix, and comprises either a combination of a monomeric polyacid and a monomeric polybase, or a combination of a basic polymer and an organic acid.
    Type: Grant
    Filed: November 18, 1997
    Date of Patent: September 12, 2000
    Assignee: SRI International
    Inventors: Asutosh Nigam, Subhash Narang, Sei-ichi Yokoi, Sivapackia Ganapathiappan, Jitender Mohan Khurana
  • Water-based ink compositions containing a binder material of a polymeric resin and a neutralizing composition
    Patent number: 6090193
    Abstract: Water-based, water-fast ink compositions are provided. The compositions contain an aqueous liquid vehicle, a colorant, e.g., a pigment, dye or stain, and a binder material capable of ionically or physically entrapping the selected colorant. Certain novel polymers are provided as well.
    Type: Grant
    Filed: October 3, 1997
    Date of Patent: July 18, 2000
    Assignee: SRI International
    Inventors: Asutosh Nigam, Subhash Narang, Sei-ichi Yokoi, Sivapackia Ganapathiappan, Jitender Mohan Khurana
  • Electromagnetic radiation absorbing devices and associated methods of manufacture and use
    Patent number: 5976666
    Abstract: Novel devices for providing shielding from and absorption of broadband electromagnetic radiation, and methods of manufacturing and using these devices, are disclosed. The device is comprised of a perforated electrical absorbing layer, containing conductive polymers, laminated to a metal plate. Additional layers may be incorporated into the device including one or more additional layers of electrical absorbing layers, magnetic absorbing layers and impedance matching layers.
    Type: Grant
    Filed: August 29, 1994
    Date of Patent: November 2, 1999
    Assignee: SRI International
    Inventors: Subhash C. Narang, Asutosh Nigam, Sei-ichi Yokoi, Robert C. Schmitt, Kenneth J. Harker, Mark A. McHenry
  • Aqueous ink compositions containing a binder of a neutralized acidic resin
    Patent number: 5973025
    Abstract: Water-based, water-fast ink compositions are provided. The compositions contain an aqueous liquid vehicle, a colorant, e.g., a pigment, dye or stain, and a binder material capable of ionically or physically entrapping the selected colorant. Certain novel polymers are provided as well.
    Type: Grant
    Filed: April 11, 1995
    Date of Patent: October 26, 1999
    Assignee: SRI International
    Inventors: Asutosh Nigam, Subhash Narang, Sei-ichi Yokoi, Sivapackia Ganapathiappan, Jitender Mohan Khurana