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:
Oct. 05, 1982
Filed:
Nov. 14, 1980
Tsuyoshi Ishida, Yokohama, JP;
Tokyo Shibaura Denki Kabushiki Kaisha, Kawasaki, JP;
Abstract
A sheet discriminating apparatus comprises, in addition to a first detecting system for detecting light transmitted through a sheet and a second detecting system for detecting light reflected by the front surface of the sheet, a third detecting system for detecting light reflected by the rear surface of the sheet. The light doses sensed by these detecting systems are integrated by respective integrators for a predetermined period of time, and the outputs obtained from the integrators are coupled to an adder and added together therein. The sum output of the adder and a reference signal generator are compared with each other in a comparator, and the determination as to whether the sheet in question is adequate for re-use or not is effected on the basis of the result of the comparison.