Patents by Inventor Donald W. Snyder

Donald W. Snyder 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).

  • Chair raiser
    Patent number: 6929328
    Abstract: Elderly and handicapped persons may have difficulty exiting some chairs. Raising the chair off the floor a few inches may make it easier for such a person to remove themselves from the chair. A chair elevating device is disclosed, having a raised surface on which to set a chair's legs and removable pegs. The removable pegs can be removed to accommodate the chair's legs and transverse cross members while helping to secure the chair to the chair raising device.
    Type: Grant
    Filed: January 21, 2004
    Date of Patent: August 16, 2005
    Inventor: Donald W. Snyder
  • DC Converter
    Patent number: 4315303
    Abstract: A small and inexpensive converter unit produces regulated multi-level low voltage DC power from a widely fluctuating high voltage DC input with short circuit protection and low current drain under no load conditions.
    Type: Grant
    Filed: December 13, 1979
    Date of Patent: February 9, 1982
    Assignee: Real Gas & Electric Company, Inc.
    Inventor: Donald W. Snyder
  • Current controlled inverter
    Patent number: 4189764
    Abstract: An inverter circuit changes direct current power into alternating current power at a desired voltage and frequency across the load and feeds power back into the direct current source by controlling the duration and spacing of controlled signals for a lightweight transformer in accordance with the direct current input voltage and a predetermined varying output voltage.
    Type: Grant
    Filed: September 26, 1978
    Date of Patent: February 19, 1980
    Inventor: Donald W. Snyder