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:
Jan. 08, 2002
Filed:
Sep. 05, 2000
Mikel John Stanich, Longmont, CO (US);
William Ashmead Courtenay Bateman, III, Longmont, CO (US);
John Charles Wilson, Longmont, CO (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A duplex printing system including two print engines arranged in tandem for printing a first and second density patch on a print medium, at least one density sensing device adapted for measuring the density of the first and second density patches printed on the print medium by the two print engines and a control for controlling the adjustment of the print engines to enable the density and dot gain of the print output of the first and the second print engines to match. The printing system of the present invention is further characterized by the measurement of the density of the density patch printed by each print engine after the print medium has advanced through the printing system. Thus, the print medium and first and second density patches printed by each print engine is subjected to the same conditions and influences as a print job processed by the printing system. Accordingly, density measurements and adjustments made to the print engines to vary the density of the print engine outputs will be realized in a print job subsequently produced by the printing system and the resultant print job will include printed images printed by two print engines that have matching print characteristics, namely matching density and dot gain.