US 11,731,430 B2
Device to supply printing material
Justin Pettingill, Boise, ID (US); Gabriel McDaniel, Boise, ID (US); Sean Daniel FitzGerald, Boise, ID (US); and Jeffrey H. Luke, Boise, ID (US)
Assigned to Hewlett-Packard Development Company, L.P., Spring, TX (US)
Appl. No. 17/413,691
Filed by Hewlett-Packard Development Company, L.P., Spring, TX (US)
PCT Filed Jul. 8, 2019, PCT No. PCT/US2019/040826
§ 371(c)(1), (2) Date Jun. 14, 2021,
PCT Pub. No. WO2021/006868, PCT Pub. Date Jan. 14, 2021.
Prior Publication US 2022/0348021 A1, Nov. 3, 2022
Int. Cl. B41J 2/175 (2006.01); B41J 29/38 (2006.01); G03G 15/08 (2006.01); G03G 21/18 (2006.01)
CPC B41J 2/17509 (2013.01) [B41J 29/38 (2013.01); G03G 15/0894 (2013.01); G03G 21/181 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A device to supply printing material to a printing material container in a printing apparatus, the device comprising:
a first container to contain printing material;
a first piston movable in the first container to exert first pressure to discharge printing material contained in the first container from the first container;
a second container having an opening to the first container; and
a second piston movable in the second container to exert second pressure higher than the first pressure to form a pressure gradient based on the first pressure and the second pressure through the opening, the pressure gradient to disperse printing material in the first container.