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:
Dec. 21, 1993
Filed:
Oct. 01, 1991
Hideyuki Takeuchi, Kyoto-city, Kyoto-Pref., JP;
Other;
Abstract
A measuring device for measuring the depth of a blind pocket formed around a tooth. A first embodiment of the measuring device has a measuring probe of optical material, such an optical fiber or rod, that has light-emitting notches or grooves near the probe tip, the notches being spaced to form a rule. The probe can be coupled to a light source, such as a penlight which can also be used as handle. The measuring probe is provided with an optical path to conduct light from the light source to the light-emitting ruler markings. A second embodiment of the measuring device has a measuring probe with a tapered tip formed by a staircase bundle of optical fibers covered by a transparent sheath. When light is introduced into a light source end of the staircase bundle of optical fibers, the opposite end in the probe's tapered tip is illuminated in a staircase pattern that can be used as rule.