Patents by Inventor Curtis I. Holmer

Curtis I. Holmer 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).

  • Acoustical door
    Patent number: 4998598
    Abstract: A light-weight acoustical door is comprised of a wood frame separating and joining first and second panels and providing a space between the panels which filled with fibrous sound-absorbing material. Each panel is comprised of at least three layers, two of which are significantly more dense than the other layer. One of the dense layers may be made from a a weighted plastic sheet. One of the panels may have grooves formed in the inner face thereof.
    Type: Grant
    Filed: May 30, 1989
    Date of Patent: March 12, 1991
    Assignee: The Ceco Corporation
    Inventors: James K. W. Mardian, Curtis I. Holmer