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. 23, 2004
Filed:
Jul. 18, 2003
Andrew John Clippingdale, Cambridge, GB;
Daniel Richard Mace, Cambridge, GB;
Simon Roger Johnson, Middlesex, GB;
Guy Charles Fernley Newcombe, Cambridge, GB;
Tonejet Limited, Hertfordshire, GB;
Abstract
A drop-on-demand printer having a row of ink ejection locations ( ) for ejecting plural ink droplets, each ejection location ( ) having an associated ejection electrode ( ) to which a voltage is applied for causing electrostatic ejection of the droplets from the respective ejection location ( ); a guard channel ( ) disposed between adjacent ejection locations ( ), each guard channel ( ) having an electrode ( ) disposed therein; and control means for applying a voltage to said guard channel electrodes ( ), said applied voltage being the average of the voltages applied in operation over a given time to the adjacent ejection location electrodes.