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:
Nov. 13, 2001
Filed:
Feb. 10, 2000
Erick Kinas, Camas, WA (US);
Eric L. Ahlvin, Corvallis, OR (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
A printer that includes a carriage, a first printhead mounted in the carriage, a second printhead printing black ink mounted in the carriage, and a third printhead mounted in the carriage, where the second printhead is between the first printhead and the third printhead. The printer further includes a print zone having left and right boundaries where text or another image is to be printed by black ink. The carriage scans such that the second printhead does not go beyond the left and right boundaries of the print zone. The leading one of the first or third printheads underprints the black ink. A trailing one of the first or third printheads overprints the black ink. Using this technique, the scanning distance is reduced by at least the width of two printheads, resulting in a 20% improvement in printing speed in one embodiment. Techniques for reducing hue shifts between adjacent print swaths are described.