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:
Mar. 19, 2002
Filed:
Jun. 16, 1998
Karai P. Premnath, Rochester, NY (US);
Stanley Dabrowny, Rochester, NY (US);
William L. King, Rochester, NY (US);
Xerox Corporation, Stamford, CT (US);
Abstract
A printhead priming operation is described which provides an improved restoration of a thermal ink jet printhead following a capping operation. In one embodiment, a printhead is moved to a capping position following a print operation. A timing sequence is initiated in which the resistors are addressed by a partial tone firing pattern. At a later time interval, the resistors are addressed by a full tone firing pattern followed by another partial tone firing pattern. This firing sequence maintains the printhead nozzles free of contaminants while lessening air bubble formation within the printhead channels and ink reservoir. Upon resumption of print operation, the printhead begins printing at a lower temperature achieved during the partial tone firing.