Patents by Inventor Fritz Marburger

Fritz Marburger 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).

  • Fluted tap
    Patent number: 4462727
    Abstract: A fluted screw tap has a plurality of thread lands each with a pair of outwardly facing flanks. Each flank of a pair has a different asymmetric relief ground flank surface extending in a spiral form along the length of the thread land. Each thread land has a corner resting against the cut thread. Each of the flank surfaces in a pair has a different relief grinding angle extending along the threaded flank and the angle approaches the zero value at the end of the thread land where the corner resting against the cut thread is located.
    Type: Grant
    Filed: October 2, 1981
    Date of Patent: July 31, 1984
    Assignee: Gunther & Co.
    Inventor: Fritz Marburger