Abstract: A drop generator includes a substrate, and a mandrel that is disposed on the substrate for shaping the drop generator chamber. The mandrel is covered by the orifice member and thereafter removed.

Abstract: A curable printing fluid composition for a thermal fluid ejection device is disclosed, wherein the printing fluid composition comprises a curable liquid-phase monomer, a volatile driver fluid capable of being vaporized by a thermal fluid ejection printhead, and a resistor protectant.

Abstract: A drop ejection device for use in a handheld inhaler is fabricated with a thin passivation layer and thin or no metal anti-cavitation layers above underlying heat transducers to provide protection for the heat transducers. A control system energizes selected heat transducers to heat fluid in the chambers, vaporizing the fluid, which is ejected through the orifices in small droplets.

Abstract: A silicon die having an orifice layer with plural openings formed therein defines a drop ejection device for use in a handheld inhaler. An underlying control layer defines fluid chambers, each carrying a heat transducer. A control system energizes selected heat transducers to heat fluid in the chambers, vaporizing the fluid, which is ejected through the orifices in small droplets.

Abstract: A drop ejector for ejecting discrete drops of liquid is disclosed. The drop ejector includes a plurality of firing chambers, and each firing chamber has an energy dissipation device. Each firing chamber is associated with a fluid feed slot configured to supply liquid to the firing chamber. A constricted inlet is positioned between the firing chamber and the fluid feed slot, through which liquid is drawn into the firing chamber from the fluid feed slot.

Abstract: A thermal ink-jet pen which includes a tuned printhead for ejecting droplets of ink onto a print medium is provided. The printhead comprises (a) a plurality of resistive elements, (b) a plurality of nozzles through which the droplets of ink are ejected, (c) a plurality of drop ejection chambers, (d) a plurality of ink feed channels, each provided with an entrance defined by a pair of projections on either side thereof, and (e) an ink refill slot operatively associated with the plurality of ink feed channels, the ink refill slot defined by an edge to provide a shelf from the edge to the ink feed channels. The plurality of resistive elements is divided into sets, with each resistive element staggered a different distance from the edge.