Patents by Inventor Alfons Listl

Alfons Listl 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).

  • Compression handle for securing a dental root-canal instrument
    Patent number: 4582489
    Abstract: In a compression handle for securing a dental root-canal instrument, a helical spring (10) is positioned between the threaded end (2) of the grip (1) and the screw-on cap (3) and loosely surrounds the shaft (5) of the instrument with its coils extending in the opposite direction from that of the threading and with its ends accommodated stationary in bores (12 & 13) in the threaded mechanisms (2 & 3) in such a way that it is screwed in and compresses the shaft of the instrument when the cap is screwed on.
    Type: Grant
    Filed: January 28, 1985
    Date of Patent: April 15, 1986
    Assignee: Vereinigte Dental-werke Antaeos-Beutelrock-Zipper Zdarsky Ehrler GmbH & Co. KG
    Inventor: Alfons Listl