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US 8,556,394 B2Granted
Ink supply
AssigneeHewlett-Packard Development Company, L.P.
InventorsQiong Chen, Julita Oentojo, Yat Yuen Chan, Swei Jen Wong
Life of this patent
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Abstract
An ink supply containing an alkaline ink passivates a silicon diaphragm of a pressure sensor against etching from the alkaline ink using a silicon dioxide layer.
Claims8
An ink supply comprising:
- an enclosure;
- a bag within the enclosure;
- an alkaline ink within the bag;
- a pressure sensor configured to sense a pressure differential between an interior of the bag and an exterior of the bag within the enclosure, the pressure sensor having a surface exposed to and in contact with the alkaline ink, wherein the surface is passivated against etching by the alkaline ink with silicon dioxide.
1 more element
Dependencies are inferred from the claim text.