Patents by Inventor Ross H. Plovnick

Ross H. Plovnick 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).

  • Low density silicon nitride-containing beads, aggregates thereof, and method for preparing same
    Patent number: 5665279
    Abstract: A sintered bead that includes at least 95% by weight silicon nitride, based on the total weight of the bead, and has a bulk density no greater than about 60% of theoretical density. The invention further features aggregates prepared from a plurality of such beads, as well as methods for preparing the beads and aggregates.
    Type: Grant
    Filed: November 4, 1996
    Date of Patent: September 9, 1997
    Assignee: Minnesota Mining & Manufacturing Company
    Inventor: Ross H. Plovnick