Es wird ein Brennstoffzellenstapel mit Zelleneinheiten bereitgestellt, die eine Sammelleitung, eine offene Endplatte, die an einer Seite der Zelleneinheiten angeordnet ist und einen Reaktionsgaseinlass und -auslass hat, die mit der Sammelleitung verbunden sind, und eine geschlossene Endplatte enthalten, die an der an der anderen Seite der Zelleneinheiten angeordnet ist und die Sammelleitung abschliest. Insbesondere enthalt die Endplatte eine erste schrage Oberflache, die die Stromung eines Reaktionsgases am Reaktionsgaseinlass und an der Sammelleitungs-Schnittstelle regelt. Ein erster Ausrichtungsvorsprung bildet die erste schrage Oberflache und richtet die Zelleneinheiten aus, und die geschlossene Endplatte enthalt eine zweite schrage Oberflache, die die Stromung des Reaktionsgases an der Sammelleitungs-Schnittstelle regelt. Auserdem bildet ein zweiter Ausrichtungsvorsprung die zweite schrage Oberflache und richtet die Zelleneinheiten entsprechend aus.

Fuel cell stack

A liquid ink, drop-on-demand printhead includes a substrate having a plurality of drop-emitter orifices, an ink channel coupled to each of the orifices for delivery of a body of ink to the orifices at a pressure above ambient, thereby forming an ink meniscus at the orifices. Drop selection is effected by selectively delivering heat to ink which has been delivered to selectively addressed ones of the orifices, thereby causing a difference in meniscus position between ink in addressed and non-addressed orifices. A heater is suspended in each ink meniscus close to its surface when the meniscus is at its position in a non-addressed orifice, the heater being effective to heat the meniscus and to thereby reduce surface tension of the meniscus at selectively addressed orifices.

Ink printing apparatus with improved heater

Floor covering, including hard floor panels which, at least at the edges of two opposite sides, are provided with coupling parts, cooperating which each other, substantially in the form of a tongue and a groove, wherein the coupling parts are provided with integrated mechanical locking elements which prevent the drifting apart of two coupled floor panels in a direction (R) perpendicular to the related edges and parallel to the underside of the coupled floor panels, and provide a snap-action coupling.

Floor panels with edge connectors

An apparatus including a first cartridge, a sensor, and a controller. The first cartridge can include a first release device configured to release a first substance into a housing. The controller can be configured to receive data from the sensor. The controller can determine an amount of first substance released by the first cartridge based on the data. The first release device can be controlled based on the determined amount of first substance.

Inhalation device including substance usage controls

The invention provides methods and apparatus for nebulizing liquids. In one exemplary embodiment, an apparatus is provided which comprises a thin shell member having a front surface, a rear surface, and a plurality of apertures extending therebetween. The apertures are tapered to narrow from the rear surface to the front surface. A liquid supplier is further provided which delivers a predetermined unit volume of liquid to the rear surface. A vibrator vibrates the thin shell member to eject liquid droplets from the front surface of the thin shell member.

Liquid dispensing apparatus and methods

This invention provides an improved ink flow path between an ink reservoir and vaporization chambers in an inkjet printhead. In the preferred embodiment, a barrier layer containing ink channels and vaporization chambers is located between a rectangular substrate and a nozzle member containing an array of orifices. The substrate contains two linear arrays of heater elements, and each orifice in the nozzle member is associated with a vaporization chamber and heater element. The ink channels in the barrier layer have ink entrances generally running along two opposite edges of the substrate so that ink flowing around the edges of the substrate gain access to the ink channels and to the vaporization chambers.

Ink delivery system for an inkjet printhead

A printhead for an inkjet printer employs an integral pump disposed in an ink feed channel, input well, or output well to circulate ink to the ink expulsion chambers in the printhead.

Printhead with pump driven ink circulation

An ink fill slot can be precisely manufactured in a substrate utilizing photolithographic techniques with chemical etching, plasma etching, or a combination thereof These methods may be used in conjunction with laser ablation, mechanical abrasion, or electromechanical machining to remove additional substrate material in desired areas The ink fill slots are appropriately configured to provide the requisite volume of ink at increasingly higher frequency of operation of the printhead by means of an extended portion that results in a reduced shelf length and thus reduced fluid impedance imparted to the ink The extended portion is precisely etched to controllably align it with other elements of the printhead

Fabrication of ink fill slots in thermal ink-jet printheads utilizing chemical micromachining

The configuration of an ink inlet through which flows ink into a chamber for expulsion from the chamber by a thermal process is such that a vapor bubble generated by the thermal process to eject ink from the chamber expands to simultaneously occlude the inlet, thereby to separate the ink within the chamber from ink within a channel that is in fluid communication with the inlet The separation eliminates a liquid path between the chamber and the channel so that substantially no ink is blown back into the channel as the bubble expands, thereby improving the thermal efficiency of the process

Bubble valving for ink-jet printheads

The use of lumped resistive elements (28) in an ink feed channel (10) between an ink-propelling element, such as a resistor, (12) and an ink supply plenum (14) provides a means of achieving resistive decoupling and meniscus resonance control with a minimum of deleterious side effects and design compromises typical of prior art solutions. A secondary constriction (30) in the ink feed channel is defined by a width W2 sufficient to provide physical support for the resistive elements while avoiding resistance to ink refill. The printhead further comprises lead-in lobes (38) for assisting in purging any bubbles in the ink. The lobes are disposed between the projections and the plenum chamber and separate one pair of projections from a neighboring pair.

Kenneth E. Trueba

Papers

Ink delivery system for an inkjet printhead

Printhead with pump driven ink circulation

Fabrication of ink fill slots in thermal ink-jet printheads utilizing chemical micromachining

Bubble valving for ink-jet printheads

Hydraulically tuned channel architecture