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. 24, 1981
Filed:
Apr. 28, 1980
Noboru Inoue, Tokyo, JP;
Kabushiki Kaisha Dental Electronics Kenkyujo, Tokyo, JP;
Abstract
A measurement channel oscillator and a reference channel oscillator are provided in combination, a measurement probe and a mouth mucose lead element are respectively connected to the measurement channel oscillator, while one of a plurality of equivalent circuits each consisting of a pair of equivalent capacitor and equivalent resistor connected in parallel is selectively connected to the reference channel oscillator, the respective equivalent circuits corresponding to different stages of a decayed tooth, and the outputs of the measurement channel oscillator and the reference channel oscillator are respectively connected through the respective channels of a 2-channel stereo amplifier to a stereo head-phone, whereby an erosion stage of a decayed tooth can be correctly examined even if it is located at a hardly visible position in the mouth.