Patents by Inventor Tetsuko Kitayama

Tetsuko Kitayama 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).

  • Iridescent composition and the process of preparing the same
    Patent number: 3969433
    Abstract: A stabilized light reflecting iridescent polymeric material is provided. The new material comprises a three dimensional non-contiguous regular structure of uniform polymeric microspheres, wherein the center to center distance between the microspheres is in the range from about 1.500 to about 15,000A. The microspheres are obtained from a cross-linked polymeric latex and have a particle diameter size in the range from about 500 to about 10,000A. The polymeric structure is stabilized by polymerizing the suspending medium. The polymerized suspending medium containing the latex particles has a refractive index relationship expressed by the formula ##EQU1## wherein n.sub.1 is the average refractive index of the polymerized suspending medium, n.sub.2 is the average refractive index of the latex particles, and .alpha. is the degree of swelling of the latex particles in the suspending medium to provide optical discontinuity.
    Type: Grant
    Filed: May 8, 1974
    Date of Patent: July 13, 1976
    Inventors: Akira Kose, Tetsuko Kitayama