Patents by Inventor Jean P. Dworaczek

Jean P. Dworaczek 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).

  • Process for installing a helical added thread in an internally threaded orifice for repairing the internal threads of the orifice
    Patent number: 5255423
    Abstract: To repair the internal thread (2b) of a large diameter orifice, an added thread is screwed into the orifice in a form wound on a threaded part of the surface of a drum screwed into an internally threaded centering ring engaged in the entry part (2a) of the orifice (2). The thread is laid against the internal thread (2b) and fastened in place by installing a pin passing through the thread and engaged in the wall of the orifice (2). The process is used for repairing the internal threads of orifices (2) machined in the flange of a pressurized-water nuclear reactor vessel, allowing the vessel cover to be bolted down sealingly.
    Type: Grant
    Filed: October 8, 1991
    Date of Patent: October 26, 1993
    Assignee: Framatome
    Inventors: Jean P. Dworaczek, Daniel Grypczynski