Patents by Inventor David H. Howell

David H. Howell 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).

  • Ionizing radiation post-curing of objects produced by stereolithography and other methods
    Patent number: 6107008
    Abstract: An object comprised of a curable material and formed by stereolithography or another three-dimensional prototyping method, in which the object has undergone initial curing, is subjected to post-curing by ionizing radiation, such as an electron beam having a predetermined beam output energy, which is applied in a predetermined dosage and at a predetermined dose rate. The post-cured object exhibits a property profile which is superior to that which existed prior to the ionizing radiation post-curing.
    Type: Grant
    Filed: August 29, 1997
    Date of Patent: August 22, 2000
    Assignees: Lockheed Martin Energy Research, Lockheed Martin Energy Systems, Inc.
    Inventors: David H. Howell, Claude C. Eberle, Christopher J. Janke