US 11,780,226 B2
Fluid ejection devices
Chien-Hua Chen, Corvallis, OR (US); Michael G. Groh, Corvallis, OR (US); Bo Song, Corvallis, OR (US); and Veronica Frances Burnett Krim, Corvallis, OR (US)
Assigned to Hewlett-Packard Development Company, L.P., Spring, TX (US)
Filed by Hewlett-Packard Development Company, L.P., Spring, TX (US)
Filed on Apr. 14, 2021, as Appl. No. 17/230,053.
Application 17/230,053 is a continuation in part of application No. PCT/US2019/044178, filed on Jul. 30, 2019.
Prior Publication US 2021/0276332 A1, Sep. 9, 2021
Int. Cl. B41J 2/16 (2006.01); B41J 2/14 (2006.01)
CPC B41J 2/1606 (2013.01) [B41J 2/1433 (2013.01); B41J 2002/14475 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A fluid ejection device comprising:
a nozzle plate including a non-coplanar surface including a hydrophilic region of hydrophilic material having a water contact angle from about 50° to about 90° and a hydrophobic coating including a hydrophobic material having a water contact angle from about 91° to about 160°,
wherein the hydrophilic region defines an opening of an ejection port and the hydrophobic coating is located outside of and around the opening and the hydrophilic region providing a recess around the opening on the nozzle plate of the fluid ejection device; and
wherein the hydrophilic region defines a floor surface of a channel on the nozzle plate and the hydrophobic coating defines a sidewall surface of the channel providing an ink puddle control structure on the nozzle plate of the fluid ejection device such that the hydrophilic region comprises a wider cross-section in an area further away from the ejection port and a relatively thinner cross-section in an area closer to the ejection port.