Heater stack and method for making heater stack with cavity...

Details Heater stack and method for making heater stack with cavity... Heater stack and method for making heater stack with cavity...

2008-11-05

2011-12-20

Luu, Matthew (Department: 2861)

Incremental printing of symbolic information

Ink jet

Ejector mechanism

Reexamination Certificate

active

08079672

ABSTRACT:
A heater stack includes first strata configured to support and form a fluid heater element responsive to repetitive electrical activation and deactivation to produce repetitive cycles of fluid ejection from an ejection chamber above the heater element and second strata overlying the first strata and contiguous with the ejection chamber to protect the heater element. The first strata includes a substrate with a cavity formed either in or above the substrate, a heater substrata overlying the cavity and substrate, and a decomposed layer of material between the substrate and heater substrata and processed to provide the cavity substantially empty of the layer of material such that the cavity provides a means which, during repetitive electrical activation, enables the heater element to transfer heat energy into the fluid in the ejection chamber for producing ejection of fluid therefrom substantially without transferring heat energy into the substrate.

REFERENCES:
patent: 7195343 (2007-03-01), Anderson et al.
patent: 7449280 (2008-11-01), Johnson et al.
patent: 2006/0103694 (2006-05-01), Nguyen
patent: 2009/0315951 (2009-12-01), Lebens et al.
Wikipedia Article—Polyimide, retrieved online Feb. 18, 2011, section titled Applications.

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