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. 20, 1976
Filed:
Jul. 23, 1974
Algirdas J Krygeris, Richmond Heights, OH (US);
John M Manring, Cleveland Heights, OH (US);
Harris Corporation, Cleveland, OH (US);
Abstract
A method for compensating measurements of optical density of ink printed by a printing press in which amounts of light reflected from a printed test patch area and from an adjacent unprinted reference area are measured. The measurement sensitivity of sensing apparatus for measuring light from the printed test area need not be equal to the measurement sensitivity of sensing apparatus for measuring light from the unprinted reference area because the relative sensitivities of the two sensing apparatuses are ascertained before the press starts printing. The relative sensitivities are ascertained by making preliminary measurements of light from areas known to have equal reflection densities, for example unprinted paper. The results of these preliminary measurements are stored in a memory and employed later automatically to compensate density measurements based on readings made by the two sensing apparatuses while the press is printing.