Patents by Inventor Leo Gumbiller

Leo Gumbiller 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).

  • Shoe usable for walking and roller-skating
    Patent number: 3983643
    Abstract: A shoe usable for walking or roller skating is disclosed wherein the roller skating means is contained within the sole of the shoe. The skating means is selectively engageable so that the shoe can be used with little effort for either mode of transportation.
    Type: Grant
    Filed: May 23, 1975
    Date of Patent: October 5, 1976
    Inventors: Walter Schreyer, Leo Gumbiller