Hewlett-packard Development Company, L.P.

John McNeilly

Bryan Murphy

Kevin Rourke

Eugene Cahill

John Breen

Patrick Lynch

Fiona Coyle

Jefferson Patrick Ward

William Scott Osborne

David B Novak

John A Doran

James Mannion

Declan Coyne

Odhran Hendley

Jon Rittgers

Coilin Hegarty

Kevin Lawlor

Cormac OBeirne

In an example, replaceable print apparatus component authentication apparatus comprises a memory and circuitry. An electrical characteristic of the circuitry may be variable in response to a stimulus, and the memory may store data indicative of an expected variation in the electrical characteristic in response to the stimulus which is associated with a variation in capacitance.

Print apparatus component authentication

In an example, a method comprises fabricating a first validation device for association with a first replaceable print apparatus component. The device may be to form part of circuitry arranged on the first replaceable print apparatus component, and may provide an associated electrically detectable characteristic which varies with the position of at least part of the first validation device. The electrically detectable characteristic may be measured and data indicative of the characteristic may be stored in a first memory. The first replaceable print apparatus component comprising the first device and the first memory may be assembled.

Replaceable print apparatus components comprising memory

A printing material supply may include a body to contain a printing material, a latch pivotably coupled to the body by a living hinge and a latch protector. The latch protector may include a structure coupled to and projecting from the body so as to contact a packaging surface of a package to inhibit creep of the latch about the living hinge when the printing material supply is contained within the packaging.

Latch protector

An ink cartridge is disclosed that includes a single cast reservoir portion of a first polymer configuration, the reservoir portion including raised walls that extend up to a top edge, the raised walls including a back wall. A latch handle protrudes from the back wall. A single cast lid is attached to the top edge. The lid is of a second polymer configuration that is stronger than the first polymer configuration.

Ink cartridge

Liquid supply or reservoir therefore having multiple compartments, each compartment to hold a distinct liquid, comprising multiple liquid outlets, each fluidically connected to one of the compartments, multiple clearance cut outs disposed at a pitch equal to a pitch of the compartments to accommodate protrusions of a dispenser, and at least one latch protruding outwards from a supply wall.

Replaceable liquid supply having cut outs and latch

In one example, a group of printing fluid cartridges in which each cartridge includes: a reservoir; a printing fluid outlet from the reservoir; multiple electrical contacts arranged next to one another across the cartridge with an interface along the cartridge between each pair of adjacent electrical contacts; and multiple guideways next to the electrical contacts lengthwise and configured to align the cartridge to a receiver when the cartridge is installed in the receiver. Each of the guideways spans exactly one of the interfaces widthwise and is configured to simultaneously align the electrical contacts to corresponding electrical contacts on a receiver and to discriminate the cartridge from other printing fluid cartridges to prevent the cartridge from being inserted incorrectly into a receiver.

Fluid cartridge

A fluid cartridge sub-assembly comprising a first vent bore, an elongate air channel, a cover extending over the first vent bore and the air channel, and a second vent bore connected to the air channel.

Growing community of inventors

Dublin, Ireland

John McNeilly