Patents by Inventor Stephen L. Kral

Stephen L. Kral 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).

  • Mid-wheel drive wheelchair with front wheel multiple bias suspension and anti-tip assembly
    Patent number: 6460641
    Abstract: A wheelchair has a plurality of central wheels which can be either power or manually driven, at least one rear caster wheel, and at least one resiliently biased ground engaging front wheel having a multiple suspension assembly. The wheelchair has improved tracking since the front wheel is maintained on the ground even on undulating, bumpy, or irregular surfaces. The wheelchair also has improved stability since the front ground engaging wheel also acts as a resiliently biased anti-tip wheel.
    Type: Grant
    Filed: June 29, 2000
    Date of Patent: October 8, 2002
    Assignee: Invacare Corporation
    Inventor: Stephen L. Kral
  • Materials handling system
    Patent number: 4406570
    Abstract: An improved material handling and storage system for receiving articles in the form of long rolls or boxes and for storing them in predetermined bin areas. The system includes novel support and transfer assemblies for moving the articles and also transfer loading and packaging stations for respectively initially receiving the articles and loading them on the transfer assemblies prior to storage and for packaging the articles following their removal from their storage bin area.
    Type: Grant
    Filed: September 30, 1980
    Date of Patent: September 27, 1983
    Assignee: Burlington Industries, Inc.
    Inventors: L. Scot Duncan, Richard W. Germuska, Stephen L. Kral, Robert R. Lasecki, Michael W. Riley
  • Panic-type device having fusible section in push rod to avoid unintentional opening of door in event of fire
    Patent number: 4311329
    Abstract: Push rod of panic-type latching device contains a fusible section which melts in the event of a hot fire so that the temperature will not cause elongation of push rod to disengage upper door latch.
    Type: Grant
    Filed: November 2, 1979
    Date of Patent: January 19, 1982
    Assignee: Scovill Inc.
    Inventor: Stephen L. Kral