Patents by Inventor Raymond O. Keltner

Raymond O. Keltner 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: 3999220
    Abstract: Helmets, shoulder pads, thigh pads and other protective equipment employ a cushioning fluid such as a layer of compressed air to protect both the wearer and an opposing player in contact sports. The helmet or other device has outer and inner walls of resilient material spaced apart to form an air chamber. A central plastic shield disposed between the resilient walls imparts shape and rigidity to the device and has multiple perforations to equalize the air pressure throughout the chamber when the walls flex under impact.
    Type: Grant
    Filed: April 22, 1976
    Date of Patent: December 28, 1976
    Inventor: Raymond O. Keltner
  • Patent number: D261781
    Type: Grant
    Filed: October 22, 1979
    Date of Patent: November 10, 1981
    Inventor: Raymond O. Keltner