The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 27, 2018
Filed:
Jul. 02, 2015
Applicant:
William B. Johnson, Tulsa, OK (US);
Inventor:
William B. Johnson, Tulsa, OK (US);
Assignee:
Dentsply Sirona, Inc., York, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
A61C 5/42 (2017.01); A61C 5/02 (2006.01);
U.S. Cl.
CPC ...
A61C 5/023 (2013.01); A61C 5/42 (2017.02);
Abstract
An improved rotary endodontic file includes a multi-planar pre-curved apical portion having a first and a second curvature. The pre-curved apical portion begins at about one-third to one-quarter of the working length as measured from the tip end of the endodontic instrument. The first and second curvature permit the file to continually search and engage the walls of a tooth root canal in a forced inside-forced outside manner. As the file works its way down, it breaks free of any ledges encountered, probes lateral- and delta-type openings, and does not allow the file to stray from the curvature of the canal.