Jaime H Bohorquez, Charles E Schinner, John H Dion, Arthur R Hart, Niels J Nielsen: Protective capping apparatus for an ink-jet pen. Hewlett Packard Company, October 28, 1997: US05682186 (165 worldwide citation)

An ink pen is provided with a protective capping apparatus to protect against damage caused by the ingress of dirt and debris, the accumulation or solidification of ink, the discharge of static electricity or the like. The protective capping apparatus has a protective cap movable between an open pos ...

John H Dion, Thomas H Winslow: Method and apparatus for extending the environmental operating range of an ink jet print cartridge. Hewlett Packard Company, February 12, 1991: US04992802 (108 worldwide citation)

An ink jet print cartridge includes an ink reservoir, a print head for ejecting ink from the reservoir and first and second pressure control mechanisms for limiting the reservoir underpressure. The first pressure control mechanism limits reservoir underpressure by controllably introducing replacemen ...

Bruce Cowger, Niels J Nielsen, John H Dion: Thermal ink jet pen having a feedtube with improved sizing and operational with a minimum of depriming. Hewlett Packard Company, June 5, 1990: US04931811 (80 worldwide citation)

An ink jet pen having a main ink reservoir therein connected to a thin film printhead by way of a large diameter standpipe, wherein the diameter of an air accumulating section of the standpipe is sufficiently large to enable ink to pass through the standpipe despite the presence of air in the air ac ...

Catherine Rotering, John H Dion, James A Harvey, Eric Joseph Johnson, James P Kearns, Donald L Michael, Alan Shibata: Printhead servicing system and method using a moveable wiper between a fluid source and a printhead. Hewlett Packard Company, Jerry R Potts, June 22, 1999: US05914734 (46 worldwide citation)

A wet-wiping printhead cleaning system including a source of treatment fluid further including a treatment fluid reservoir and a treatment fluid transfer element adapted to transfer treatment fluid from the reservoir to at least one of the two elements involved in wiping the printhead, the two such ...

Donald L Michael, John H Dion, James A Harvey, James P Kearns, Catherine Rotering, Alan Shibata: Print head servicing system and method employing a solid liquefiable substance. Hewlett Packard Company, Jerry R Potts, October 19, 1999: US05969731 (42 worldwide citation)

A wet-wiping printhead cleaning system wherein a treatment fluid is applied to at least one of the printhead and wiper elements in an inkjet printer, then subsequently the wiper wipingly contacts the printhead and wipes a portion of the printhead orifice plate where the nozzle orifices are located r ...

Bruce Cowger, John H Dion, William E Peters: Ink jet pen with improved volumetric efficiency. Hewlett Packard Company, April 23, 1991: US05010354 (32 worldwide citation)

An ink jet pen (10) having a primary ink reservoir (12) connected to a printhead (16) and to a chamber (18) containing a capillary volume element (20). The pressure within the capillary element (20) is greater normal sub-atmospheric pressure within the ink reservoir (12) but is less than atmospheric ...

Bruce Cowger, John H Dion: Controlled capillary ink containment for ink-jet pens. Hewlett Packard Company, September 10, 1991: US05047790 (26 worldwide citation)

Ink contained in a pen reservoir (12) is subject to the capillarity provided by an array of spaced apart capillary members (10). The capillarity provided by the capillary members (10) is sufficient for establishing a back pressure at the print head (18) of the pen (14) to thereby avoid leakage of in ...

John H Dion: Tape automated bonded (tab) circuit and method for making the same. Hewlett Packard Company, July 31, 1990: US04944850 (24 worldwide citation)

Improved TAB circuit and method for producing the same. Specifically, new methods and materials are used to electro-plate and test TAB circuits. A typical TAB circuit includes a substrate having a plurality of conductive traces thereon, each trace terminating in a lead. All of the leads extend inwar ...

Brian L Helterline, John H Dion, Michael D Whitmarsh: Method and apparatus for regulating print density in an ink-jet printer. Hewlett Packard Corporation, December 5, 1995: US05473351 (20 worldwide citation)

Method and apparatus for regulating print density in a printer of the type of an ink-jet printer having a print cartridge including nozzles which each fire ink therefrom responsive to a voltage pulse applied to a resistor in the nozzle. An optical sensor senses line width printed by the nozzles. Cir ...

Carrie Roberts, Roberta Stinson, John H Dion, Mark L McCarty: Printing mechanism. Hewlett Packard Development Company, September 16, 2003: US06619792 (7 worldwide citation)

A printing mechanism comprises a printhead that defines a printzone, and a tray adapted to support at least one sheet of print media. The tray is adapted to move through the printzone during printing by the printhead on the sheet.