Patents by Inventor David W. Jahn

David W. Jahn 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).

  • Flat and elongated device for measuring particle sizes
    Patent number: 6145390
    Abstract: An apparatus for measuring dimensions of particles includes a base. At least three fixed posts are mounted to the base. A swinging arm is pivotally mounted to the base about a pivot point. The swinging arm has a first section mated with a first of the at least three fixed posts, a second arm mated with a second and a third of the at least three fixed posts, and a third section connecting the first and second sections. The first section has a first length and the second section has a second length. A first opening is formed when the first section and the first fixed post are not in contact. Second and third openings are formed when the second section does not contact the second and third fixed posts.
    Type: Grant
    Filed: January 20, 1999
    Date of Patent: November 14, 2000
    Assignee: Martin Marietta Materials, Inc.
    Inventors: David W. Jahn, Patrick A. Jacomet