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. 20, 1998
Filed:
Jul. 29, 1994
Earl L Barton, Corvallis, OR (US);
Thomas J Purwins, Vancouver, WA (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
A method and apparatus clears blocked nozzles in an inkjet primer printhead by placing the printhead in a position relative to a service station such that ink which is expelled from the nozzles is captured without reaching the medium upon which printing is to occur. Ink is expelled for a first time segment from each nozzle in a first pattern for a number of nozzle expulsions. Following the first time segment, a pause period is entered. Following the pause, ink is expelled in a second time segment from each nozzle in a second pattern for a second number of nozzle expulsions before the printer enters the print status mode.