Patents by Inventor Lynn W. Tillman

Lynn W. Tillman 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).

  • Calculator apparatus with annuity switch for performing begin-and end-period annuity calculations
    Patent number: 4055757
    Abstract: A programmable electronic calculator is provided having a manually operable annuity switch with begin- and end-position settings, enabling a user to specify the type of annuity calculation to be performed. When the switch is set to the begin position, the annuity calculation is performed with payments due at the beginning of each payment period; when the switch is set to the end position, the annuity calculation is performed with payments due at the end of each payment period. The annuity calculation is performed under control of a routine stored in a read-only-memory (ROM) of a data processing unit.
    Type: Grant
    Filed: August 27, 1976
    Date of Patent: October 25, 1977
    Assignee: Hewlett-Packard Company
    Inventors: Lynn W. Tillman, Kent R. Henscheid, Larry D. Smith