Patents by Inventor Herbert W. Alsbury

Herbert W. Alsbury 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: 5094572
    Abstract: A flat drill for boring holes through hard metals and high heat resistance materials such as hard metal and fiberglass. The flute or fluid portion forms a spade with slightly cylindrically concave faces which tend to distally converge. The cutting edges at the base of the drill have a negative rake angle, but a relatively high clearance for this type of drill. The lateral leading edges have a positive rake angle, but are strengthened by cylindrically convex flanks. Nose splits form a small but relatively keen small central burrowing edge which stabilizes the drill.
    Type: Grant
    Filed: December 4, 1989
    Date of Patent: March 10, 1992
    Assignee: Thomas Grismer
    Inventors: Herbert W. Alsbury, Robert A. Sheffler