Patents by Inventor Timothy Fred Ahlers

Timothy Fred Ahlers 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).

  • Spreadsheet recalculation engine version stamp
    Patent number: 6523167
    Abstract: A recalculation engine version stamp is employed to determine whether a spreadsheet program file should be fully recalculated upon opening. When a spreadsheet program file is recalculated and saved, a recalculation engine version stamp is written to the file. The recalculation engine version stamp corresponds to the version of the calculation engine of the application program that last recalculated and saved the program file. When the program file is opened in a spreadsheet application program, the recalculation engine version stamp is compared to the calculation engine version number of the spreadsheet application program. If the calculation engine version number of the spreadsheet application program is more recent than the recalculation engine version stamp of the spreadsheet program file, then a full recalculation of the spreadsheet program file is performed.
    Type: Grant
    Filed: October 12, 1999
    Date of Patent: February 18, 2003
    Assignee: Microsoft Corporation
    Inventors: Timothy Fred Ahlers, Andrew J. Becker