Patents by Inventor Henry D. Winslow

Henry D. Winslow 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).

  • Portable calculator for refrigeration heating and air conditioning equipment service
    Patent number: 5209400
    Abstract: A calculator apparatus 10 includes the standard calculator mode and several other modes functions namely; a pressure-temperature conversion, a temperature-to-pressure conversion based on refrigerant, a relative humidity reading based on input of the dry bulb and wet bulb temperature; and a flow-energy rate conversion mode based upon a selected fuel meter dial and Metric or English units. In addition, a Fahrenheit-to-centigrade conversion and a centigrade-to-Fahrenheit conversion functions are incorporated. The calculator includes a keyboard 18, a microprocessor 16, a timer 26, a power source 12, a switch 14 and a display screen 22.
    Type: Grant
    Filed: March 7, 1991
    Date of Patent: May 11, 1993
    Assignees: John M. Winslow, Henry D. Winslow
    Inventors: John M. Winslow, Henry D. Winslow, Walter Rubinstein