Patents by Inventor Paul Nachtigal

Paul Nachtigal 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).

  • Combination calculator and time billing device
    Patent number: 4164038
    Abstract: A portable calculator is adapted to provide a time billing function and a calculating function. A "stop watch" function is actuated to start the billing period and stop the billing period attributable to a particular account. A memory stores the accumulated billing time for the particular account until properly cleared.
    Type: Grant
    Filed: July 5, 1977
    Date of Patent: August 7, 1979
    Inventor: Paul Nachtigal