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:
Jul. 18, 1995
Filed:
Jul. 07, 1994
James L Murphy, Streamwood, IL (US);
Inventio AG, Hergiswil NW, CH;
Abstract
An indicating element for an elevator includes a cover plate having an opening formed therein through which a lens extends. Positioned behind the lens is a light diffuser having an area formed in the shape of a symbol to be displayed. A plurality of light emitting diodes are mounted on a front surface of a printed circuit board and the diodes extend into the diffuser. The front surface of the printed circuit board, as well as the side walls of the diffuser are white to achieve a better light reflection. The lens, the diffuser and the printed circuit board are mounted on studs extending from a rear surface of the cover plate and are retained by nuts. The light emitting diodes are connected together in separate groups with a first switch for connecting the groups in series to a higher voltage alternating current power supply and a second switch for connecting the groups in parallel to a lower voltage direct current power supply.