Patents by Inventor Mitsura Ohta

Mitsura Ohta 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).

  • Powdered developer material having specific particle diameter distribution
    Patent number: 5147746
    Abstract: Developer toner color-reactable with dye or dye precursor to form a color image, comprising developer material particles having at least one of a particle-diameter distribution in which the maximum particle diameter of the particle-diameter distribution is not greater than the second power of the average particle diameter on volume-basis of the particle-diameter distribution and another particle-diameter distribution in which Npn>Nsn (Npn represents a particle-occupied ratio on particle-number basis in a range of Dp, Nsn represents a particle-occupied ratio on particle-number basis in a range of Ds, Dp and Ds representing particle-diameter ranges satisfying the following inequalities:10.sup.(log(M)-0.05) .ltoreq.Dp.ltoreq.10.sup.(log(M)+0.0510.sup.(log(M)-0.01.times.N-0.05) .ltoreq.Ds.ltoreq.10.sup.(log(M)-0.01.times.N+0.05)where N represents an integer from 1 to 30, and M represents the average particle diameter of the particle diameter distribution on volume-basis.
    Type: Grant
    Filed: October 23, 1990
    Date of Patent: September 15, 1992
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventor: Mitsura Ohta