Patents by Inventor Choi Ying-Kit

Choi Ying-Kit 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).

  • Grating
    Patent number: 5018332
    Abstract: A grating including longitudinal tubular elements and transverse tubular elements wherein each of the longitudinal and transverse elements is intermittently staggeringly provided with a plurality of indentations respectively positioned on the upper and lower portions thereof. Such grating permits an upper (lower) indentation of a longitudinal (transverse) element to match thereabove (thereunder) a lower (upper) indentation of a transverse (longitudinal) one.
    Type: Grant
    Filed: April 11, 1990
    Date of Patent: May 28, 1991
    Inventor: Choi Ying-Kit