Patents by Inventor Duane B. Ackert

Duane B. Ackert 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: 4236623
    Abstract: An escalator step plate is provided at each edge with a narrow ramp which slopes upwardly and laterally outwardly to divert wearing apparel or other objects from the gap between the moving step plates and the stationary escalator skirt members and to lift shoes off the lateral edges of the step plate to prevent a tendency of a rider's shoe which has gotten hot from friction with the skirt member from sticking to the metal step plate. The ramp is preferably formed of smooth urethane, and may be formed integrally with the step plate or as an attachment.
    Type: Grant
    Filed: December 11, 1978
    Date of Patent: December 2, 1980
    Inventor: Duane B. Ackert