Patents by Inventor W. S. Rader

W. S. Rader 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).

  • Polishing composition and method for producing a memory hard disk
    Patent number: 6332831
    Abstract: A polishing composition for a memory hard disk, which comprises at least the following components (a) to (d): (a) from 0.1 to 50 wt %, based on the total amount of the polishing composition, of at least one abrasive selected from the group consisting of silicon dioxide, aluminum oxide, cerium oxide, zirconium oxide, titanium oxide, silicon nitride and manganese dioxide, (b) from 0.001 to 10 wt %, based on the total amount of the polishing composition, of at least one periodate selected from the group consisting of periodic acid, potassium periodate, sodium periodate and lithium periodate, (c) a buffer component to adjust the pH of the polishing composition to a range of from 2 to 5, and (d) water.
    Type: Grant
    Filed: April 6, 2000
    Date of Patent: December 25, 2001
    Assignee: Fujimi America Inc.
    Inventors: David M. Shemo, W. S. Rader, Toshiki Owaki