Patents by Inventor Katherine Rannenberg

Katherine Rannenberg 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).

  • Perpetual or long life calendar
    Patent number: 4201405
    Abstract: The useful life of a calendar is extended by reusing all portions which repeat from year to year. The calendar assembly consists of two separately bound groups of pages: one bearing the names of the months and the other bearing the various combinations of days of the month, arranged in such a manner that the calendar is easy to use and has the minimum number of sheets of paper used in its construction.
    Type: Grant
    Filed: April 18, 1978
    Date of Patent: May 6, 1980
    Inventor: Katherine Rannenberg