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:
May. 09, 2000
Filed:
Nov. 12, 1998
Masahiro Otsuka, Kawasaki, JP;
Toei Electric Co., Ltd., Kanagawa, JP;
Abstract
The present invention provides an apical position detection apparatus for accurately detecting the fact that a measuring electrode arrives at the apical position. The apparatus has a first current value measuring means for measuring a first frequency value by supplying a first frequency signal between the measuring electrode and the oral electrode, a second current value measuring means for measuring a second frequency value by supplying a second frequency signal between the measuring electrode and the oral electrode, arithmetic means for obtaining logarithmically converted calculation value by using a first measurement signal and a second measurement signal, and position signal formation means for obtaining an apical position detecting signal by addition or subtraction of the first measurement signal and the arithmetic value.