Patents by Inventor Robert W. Johnson, Jr.

Robert W. Johnson, Jr. 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).

  • Uninterruptible power supply with isolated bypass winding
    Patent number: 4673825
    Abstract: An uninterruptible power supply including a transformer having a first input winding normally coupling an inverter AC source with a critical AC load, which transformer also includes a second input winding operable to supply power from a bypass source to the load in the event of malfunction of the inverter circuit. The inverter is of the four-quadrant pulse-width-modulated type, thereby to permit recharging of the battery which serves as the DC source to the inverter. An inductance is provided for varying the phase relationship between a utility voltage source and the inverter voltage to produce minimum real inverter current and the "break-even" operating conduction, and a step-up device is provided for increasing the utility voltage to further minimize the break-even inverter current required during normal operation, and to maximize the through-put efficiency.
    Type: Grant
    Filed: February 15, 1985
    Date of Patent: June 16, 1987
    Assignee: Exide Electronics Corporation
    Inventors: William J. Raddi, Robert W. Johnson, Jr., John G. Tracy, Blazej W. Sonnenberg
  • Process for preparing rosin esters of improved color
    Patent number: 4585584
    Abstract: Tall oil rosin esters of pentaerythritol prepared in the presence of activated carbon possess an improved, lighter color.
    Type: Grant
    Filed: April 8, 1985
    Date of Patent: April 29, 1986
    Assignee: Union Camp Corporation
    Inventors: Robert W. Johnson, Jr., Roger Logan