Abstract: A method of determining a healthy fluid ejection nozzle includes measuring changes in impedance across the nozzle as fluid passes through it. A printhead includes a metal probe that intersects an ink nozzle and an integrated circuit to sense a change in impedance across the nozzle through the metal probe.

Abstract: An inkjet printhead includes a die having a heating element formed thereon. The inkjet printhead also includes a graded die carrier. The graded die carrier is coupled to the die. The graded die carrier has lands that are separated by an ink slot. Each of the lands is graded such that its proximity to the die varies.

Abstract: A system and methods authenticate sensitive information such as passwords. Password characters are transformed into distorted characters and distorted character groups are generated such that each distorted password character is part of a group. An image is created containing the groups and the password or other sensitive information is authenticated when groups are identified within the image that contain the password characters in an expected sequence.

Abstract: A fluid ejection device includes a chamber, and first and second electrodes configured to generate an electric field within the chamber. A related method includes, in a firing chamber, separating whole ink into colloidal particles and ink vehicle such that the firing fluid within the chamber comprises primarily ink vehicle.

Abstract: A piezoelectric printhead and related methods provide a first metallic electrode and a second metallic electrode deposited over a top surface and a bottom surface, respectively, of a piezoceramic plate. The second electrode is segmented into a plurality of electrode segments. A diaphragm is positioned over a plurality of pressure chambers, where the diaphragm includes a conductor positioned over each chamber. The piezoceramic plate is attached to the diaphragm such that each conductor on the diaphragm faces multiple electrode segments.

Abstract: An ink delivery system includes a plurality of ink supplies, an air pressure source to generate ink pressure for each ink supply, an ink valve associated with each ink supply, where each ink valve is configured to prevent a reverse flow of ink from a pen to the associated ink supply, and each ink valve has a switch configured to provide an open signal when the ink valve is open, and a controller configured to determine one of a normal ink condition, an out of ink condition or a system pressure problem based on receiving the open signals and to regulate the pressure source according to the determination.

Abstract: A power sequencing circuit includes a PNP transistor, a first, second and third resistor, and a logic enabled regulator. A voltage is coupled at a first node to the emitter of the transistor, the first resistor is coupled between the first node and the base of the transistor, the second resistor is coupled between the base and a grounded node, the third resistor is coupled between the grounded node and the collector of the transistor, and the logic enabled regulator has an enable pin coupled to and driven by the collector.

Abstract: Copy-protected documents are generated for intended recipients by integrating a document, each recipient name on a recipient list, and a security template into distinct copy-protected documents.

Abstract: A system and method for deploying a document classification system include deploying a document classification system with a first classification engine configuration, and thereafter, automatically redeploying the document classification system with a second classification engine configuration in response to a cost function.

Abstract: A system and methods provides secure end-to-end printing in networked computing environments, such as a corporate office environment employing a number of shared printers. The described system and methods are applicable in various scenarios to provide an enhanced solution for secure printing.

Abstract: A system including a client computer, a printer, and a translation server provides for printing from the client computer using Internet-based translation services. The system effectively transfers printer driver functions and associated resource requirements off of client computers. Advantages of the disclosed system and methods include reduced costs associated with the development of printer drivers for new printers and new versions of operating systems.