US 11,731,426 B2
Fluid feed hole corrosion detection
Donald J. Milligan, Corvallis, OR (US); Eric T. Martin, Corvallis, OR (US); and Rogelio Cicili, San Diego, CA (US)
Assigned to Hewlett-Packard Development Company L.P., Spring, TX (US)
Appl. No. 17/311,523
Filed by Hewlett-Packard Development Company, L.P., Spring, TX (US)
PCT Filed Jun. 18, 2019, PCT No. PCT/US2019/037615
§ 371(c)(1), (2) Date Jun. 7, 2021,
PCT Pub. No. WO2020/256694, PCT Pub. Date Dec. 24, 2020.
Prior Publication US 2022/0097369 A1, Mar. 31, 2022
Int. Cl. B41J 2/175 (2006.01); B41J 2/14 (2006.01); G01N 17/00 (2006.01)
CPC B41J 2/14153 (2013.01) [B41J 2/175 (2013.01); G01N 17/008 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A fluid ejection device, comprising:
a substrate that includes a fluid feed hole; and
a corrosion-detecting conductive path disposed behind a wall of the fluid feed hole;
wherein the corrosion-detecting conductive path is to close a circuit in response to exposure of the corrosion-detecting conductive path to a fluid.