Patents by Inventor Lee D. Oelrich

Lee D. Oelrich 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: 4133155
    Abstract: A joist structure having a configuration useful for constructing concrete-forming structures. The joist is comprised of an upwardly opening channel and an oppositely facing downwardly opening keyhole-shaped channel. The joist is an extruded elongate member having the respective channel end walls abutting each other. The upwardly facing channel has a generally rectangular form with the side walls being considerably wider than the end walls to accommodate standard wooden beam sizes, such as a 2 .times. 4. The downwardly facing channel, somewhat narrower and shorter than the upwardly facing channel, has a keyhole shape which considerably increases the compressive and torsion strength of the overall joist. The keyhole shape also accommodates keyhole-shaped inserts for strengthening the joist at high stress points, such as bearing surfaces and the mid-point between spans. The keyhole-shaped inserts can be provided in varying lengths according to the need and can incorporate mounting holes for the joist.
    Type: Grant
    Filed: June 29, 1977
    Date of Patent: January 9, 1979
    Inventor: Lee D. Oelrich