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, 1982
Filed:
Sep. 02, 1980
Harold A Fasig, Plymouth, MI (US);
Anthony Horak, Detroit, MI (US);
Burroughs Corporation, Detroit, MI (US);
Abstract
Apparatus for detecting the presence of documents in a document pathway employing a light source and a light sensor positioned to function in cooperation with a drum. The drum employs a peripheral surface for support of documents as they are transported across a cylindrical surface which is recessed below the peripheral surface for reflecting light. The positions of the light source and the sensor are selected so that, when no document is present, light from the light source will be reflected from the recessed cylindrical surface onto the sensor enabling the sensor to provide an output indicating no document is present. When a document is present, light from the light source will be reflected from the surface of the document along a path which will substantially miss the sensor and not energize it, thereby enabling associated circuitry to determine that a document is present.