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. 22, 1981
Filed:
Sep. 04, 1980
Cornelius M Phipps, Glen Ellyn, IL (US);
Plastic Specialties, Inc., Glen Ellyn, IL (US);
Abstract
A contact-actuated light pencil for use in detecting electrically conducting areas or materials. The light pencil includes a hollow pencil body having an aperture at one end, a tubular electrical contact at the one end which lines the aperture, and a conducting probe extending from within the pencil body through the tubular electrical contact. The probe is electrically isolated from direct contact with the tubular electrical contact by an insulator, situated within the electrical contact, which has an internal aperture for through-passage of the probe. The probe is slidably situated within the internal aperture and is resiliently biased by a spring such that a portion of the probe normally extends outside of the pencil body. A conducting path leads between the electrical contact and the probe and includes a battery and lamp which is illuminated when electrical current flows. When a conducting material is simultaneously contacted between the probe and the electrical contact, a circuit is completed and current flows through the conducting path, illuminating the lamp to give usual indication that conducting material has been encountered.