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:
Mar. 26, 1985
Filed:
Apr. 01, 1983
Constantine J Tsikos, Pennsauken, NJ (US);
Siemens Corporate Research & Support, Inc., Iselin, NJ (US);
Abstract
Apparatus is disclosed for detecting the position of an object within a viewing field, such as a CRT display screen. The apparatus includes point sources of radiation arranged at spaced locations around the edge of the viewing field and a retro-reflective surface disposed around the perimeter of the viewing field. The retro-reflective surface reflects radiation received from its originating source back toward this source. A radiation receiver is arranged adjacent to each source to receive the radiation reflected back from the retro-reflective surface and to determine the angular position of an object within the viewing field which interrupts the path of radiation.