Patents by Inventor Yumiko Tamura

Yumiko Tamura 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).

  • Semiconductor storage device
    Patent number: 11955372
    Abstract: A semiconductor storage device includes: a semiconductor substrate; a plurality of circuit regions; and an element isolation region having a trench shape formed between the circuit regions. In the element isolation region including a thermal oxide film and a silicon oxide film, a sub-trench is formed in a bottom corner portion, and the thermal oxide film covers at least an inner wall of the sub-trench.
    Type: Grant
    Filed: August 20, 2021
    Date of Patent: April 9, 2024
    Assignee: KIOXIA CORPORATION
    Inventors: Takehiro Nakai, Mizuki Tamura, Yumiko Yamashita
  • Liquid softener composition
    Patent number: 5498350
    Abstract: A liquid softener composition comprising a polyhydric alcohol ester (A) represented by the following formula (I) and a cationized cellulose (B) having a nitrogen content determined by the Kjeldahl method of from 0.1 to 4% by weight, wherein the weight ratio of (B) to (A) ranges from 0.01 to 0.
    Type: Grant
    Filed: January 13, 1995
    Date of Patent: March 12, 1996
    Assignee: Kao Corporation
    Inventors: Yushi Sakata, Yumiko Tamura, Junichi Inokoshi