Patents by Inventor David M. Christopher

David M. Christopher 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).

  • Coated metal article and method of making same
    Patent number: 7125613
    Abstract: A coated metal article includes a ferrous metal substrate, and an abraded metallic coating on the substrate, wherein the abraded metallic coating has a substantially uniform patterned appearance which simulates the surface appearance of polished stainless steel. A top coating, which may be a relatively thick PVC coating or a thin coating of polyester, epoxy, or acrylic, may overlie the abraded metallic coating on an obverse side of the substrate. The metallic coating may be a Zinc-Nickel alloy and a pre-treatment coating may be applied beneath the top coating. A primer coating may be applied beneath the PVC top coating.
    Type: Grant
    Filed: March 7, 2005
    Date of Patent: October 24, 2006
    Assignee: Material Sciences Corporation, Engineered Materials and Solutions Group, Inc.
    Inventors: Bryan Tullis, Rebecca A. Jones, Kevin R. Sanchez, James E. Blanton, Joseph M. Ilk, Santos Ares, David M. Christopher
  • Louvered air-heating solar collector
    Patent number: 4471761
    Abstract: An improved absorber unit is provided for a solar collector, said absorber unit being comprised of a unitary conductive perforated sheet, folded so that segments thereof are disposed adjacent one another and perforated so that air flow is facilitated along both sides of the absorber sheet, thereby greatly increasing convective heat transfer and efficiency of the absorber.
    Type: Grant
    Filed: March 26, 1982
    Date of Patent: September 18, 1984
    Assignee: Purdue Research Foundation
    Inventors: Joseph T. Pearson, David M. Christopher