Patents by Inventor Narayan G. Kumar

Narayan G. Kumar 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).

  • Patent number: 4500657
    Abstract: There is disclosed a dental restorative composition containing a hydrophobic polymerizable composition, a polymerization initiator, and a quartz or heat treated barium or strontium glass hydrophobic filler having an average particle size below 15 microns, with said filler being present in an amount within the range of from about 35 to about 78 volume percent.
    Type: Grant
    Filed: July 1, 1983
    Date of Patent: February 19, 1985
    Assignee: Johnson & Johnson Dental Products Company
    Inventor: Narayan G. Kumar
  • Patent number: 4492777
    Abstract: The affinity for water of acid-washed barium or strontium glass powder is reduced by a heat treatment.
    Type: Grant
    Filed: November 26, 1982
    Date of Patent: January 8, 1985
    Assignee: Johnson & Johnson Dental Products Co.
    Inventors: Robert K. Denton, Jr., Narayan G. Kumar