Hewlett-packard Development Company, L.P.

Hewlett-packard Company

Garrard Hume

Matthew Allen Shepherd

Todd A Cleland

John M Skene

Alexander N Govyadinov

Rio Rivas

Erik D Torniainen

David P Markel

Michael D Miller

Chris Bakker

Angela White Bakkom

Galen P Cook

Ron Burns

Niranjan Thirukkovalur

Gerald G Trunk

A fluid recirculation channel for dispensing a plurality of fluid drop weights includes a number of sub-channels. The sub-channels include at least one pump channel, and a plurality of drop generator channels fluidically coupled to the at least one pump channel. The fluid recirculation channel further includes a number of pump generators incorporated into the at least one pump channel, a number of drop generators incorporated into drop generator channels, and a plurality of nozzles defined within the drop generator channels, the nozzles being at least as numerous as the number of drop generators.

Fluid recirculation channels

A replaceable printer component having an integral memory for use in a printing system includes a semiconductor die and a plurality of circuits formed on the semiconductor die. Each circuit is associated with and indicates the state of a bit in the memory. The memory stores a plurality of functional bits that must match values expected by the printing system for proper operation of the printing system. The memory stores a plurality of informational bits that are not critical to proper operation of the printing system. A large percentage of the circuits associated with the functional bits are positioned substantially near a center of the semiconductor die.

Robust bit scheme for a memory of a replaceable printer component

A plate has a rectangular plate body with a plurality of nozzle arrays. The plate also has first and second end zones in between the plurality of nozzle arrays and opposing ends of the plate body, respectively. There is a break tab in at least one of the first and second end zones. In between the first and second end zones is a middle zone. A plating material encapsulates the plate body in the middle zone.

Orifice plate with break tabs and method of manufacturing

A system and method for detecting an error in data received from a memory of a replaceable printer component includes providing a first parity bit associated with a first data item. The first data item and the first parity bit are stored in the memory. The printer includes a plurality of electrically conductive lines. The memory includes a plurality of bits. At least one of the electrically conductive lines is associated with each bit. The first data item and the first parity bit are read from the memory. An electrical test of at least one of the electrically conductive lines is performed. An error in the first data item is identified based on the first parity bit read from the memory and the electrical test.

A method of manufacturing an orifice plate for a fluid ejection device comprises defining a plurality of orifice apertures in a substantially planar plate; and defining a plurality of closed slits in the plate.

Method of manufacturing an orifice plate having a plurality of closed slits

An ink jet printhead is provided with an orifice plate connected to the barrier layer, spaced apart from the substrate second major surface, enclosing the ink manifold, and defining a plurality of orifice apertures, each associated with a respective ink energizing element, wherein the orifice plate has a planar plate defining the plurality of orifice apertures and at least one groove. The at least one groove extends from an ink feed slot region of the inkjet printhead to a bubble collection area adjacent to an end firing chamber located beyond the ink feed slot region to facilitate guiding bubbles away from critical areas.

Inkjet printhead with top plate bubble management

A thermal ink jet print head with an orifice plate for defining numerous of orifice apertures and numerous strain relief elements. Each strain relief element is a closed slit between abutting and separable portions of the plate, such that a stress applied to the plate across the strain relief element will tend to open the slot, or cause the edges to move in a direction perpendicular to the plane of the plate, or otherwise provide a thin cross section that deforms more easily, thereby limiting strain in other portions of the plate.

Growing community of inventors

Corvallis, OR, United States of America

Garrard Hume