Patents by Inventor Ram Seshan

Ram Seshan 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).

  • Method and apparatus for polishing a hard disk substrate
    Patent number: 6045437
    Abstract: Substrates to be used in manufacturing hard disks are polished in a two-step process entailing a coarse and fine polishing in a single polishing machine. The use of this method and apparatus eliminates the need for two separate polishing machines and for transferring the disks from one polishing machine to another. Furthermore, the overall quality of hard disk substrates polished by this method and apparatus, including smoothness, flatness and edge roll-off, is superior to that achieved by the prior art.
    Type: Grant
    Filed: February 21, 1997
    Date of Patent: April 4, 2000
    Assignee: Tan Thap, Inc.
    Inventors: Sham Tandon, Suman Tandon, Ram Seshan