1
C S Chan, Conrad L Wright, Gary E Hanson: Large expandable array thermal ink jet pen and method of manufacturing same. Hewlett Packard Company, May 14, 1991: US05016023 (133 worldwide citation)

A hybrid type thermal ink jet (TIJ) pen and method of manufacture wherein a plurality of individual thin film ink jet printheads, each including an orifice plate, are selectively spaced on and secured to an insulating substrate having ink feed ports therein which supply ink to the printheads. Buss l ...


2
C S Chan: Off board ink supply system and process for operating an ink jet printer. Hewlett Packard Company, William J Bethurum, May 16, 1989: US04831389 (105 worldwide citation)

A system for supplying ink to an ink jet pen wherein an off board ink supply is provided remote from the pen, and ink is fed from this supply to the pen by capillary action created during an ink jet printing operation. The pen includes a porous storage medium which is initially filled with ink at a ...


3
C S Chan, Gary E Hanson, Terry M Nelson: Multi-chamber ink jet recording head for color use. Hewlett Packard Company, William J Bethurum, March 14, 1989: US04812859 (99 worldwide citation)

A multichamber ink jet pen has a printhead comprising a plurality of nozzle groups corresponding in number to the number of chambers. The nozzle groups are respectively in communication with the individual chambers for receiving ink. The multi-color ink jet pen is retrofittable in a single color pri ...


4
C S Chan: Method and system for providing closed loop color control between a scanned color image and the output of a color printer. Hewlett Packard Company, William J Bethurum, April 21, 1992: US05107332 (94 worldwide citation)

A method and system for continuously correcting for errors in color output of a color copier or printer and caused by events that occur between the input of a color image scanner and the output of a copier or printer driven thereby. This method and system includes, among other things, the continuous ...


5
Gary E Hanson, Gar P Kelly, C S Chan, Bruce Cowger, James G Bearss: Balanced capillary ink jet pen for ink jet printing systems. Hewlett Packard Company, William J Bethurum, December 13, 1988: US04791438 (77 worldwide citation)

This application is directed to an ink jet pen having an ink supply housing which includes a primary ink reservoir (30) and a secondary ink reservoir (26). A balancing capillary member is positioned within the ink supply housing and includes ink flow path (20, 24) which extends between the primary i ...


6
C S Chan: Ink supply apparatus for rapidly coupling and decoupling a remote ink source to a disposable ink jet pen. Hewlett Packard Company, March 12, 1991: US04999652 (74 worldwide citation)

An apparatus for rapidly coupling and decoupling a remote source of ink supply to a disposable ink jet pen filled with a porous ink storage material. This is accomplished without requiring an air-tight seal at the connection of ink into the pen, and is characterized by the use of a capillary tube wh ...


7
Conrad L Wright, James G Bearrs, C S Chan, Robert R Hay, Frank Ura: Thermal ink jet printhead with self-passivating elements. Hewlett Packard Company, William H MacAllister, August 13, 1985: US04535343 (74 worldwide citation)

A passivation layer in a thermal ink jet printhead is formed or "grown" by a reaction between the materials of the ink jet structure to be protected and an element which will form a chemically inert, electrically insulating, thermally conductive compound. The resistor structure may be of tantalum or ...


8
C S Chan: Method and system for reproducing monochromatic and color images using ordered dither and error diffusion. Hewlett Packard Company, W J Bethurum, July 9, 1991: US05031050 (53 worldwide citation)

A method and system for color and monochromatic printing wherein ordered dither and error diffusion processes are combined to provide high quality printed images with good spatial resolution, good gray scale transitions, good low frequency and high frequency responses and a high computational speed. ...


9
C S Chan, James G Bearss, Terry M Nelson: Method and system for enhancing the quality of both color and black and white images produced by ink jet and electrophotographic printers. Hewlett Packard Company, May 5, 1992: US05111302 (50 worldwide citation)

A method of gray scale printing of dots of one or more colors into pixels and in a controlled ordered sequence into a plurality of super pixels defined by a given number of said pixels, characterized in that: one or more levels of dot loading are used to achieve different values of gray level in a m ...


10
C S Chan, James G Bearss, Terry M Nelson: Method and system for enhancing the quality of both color and black and white images produced by ink jet printers. Hewlett Packard Company, Hewlett Packard Company, May 29, 1990: US04930018 (47 worldwide citation)

A method for reducing "grainyness" or color contrast in color imaging systems and simultaneously reducing or eliminating paper cockleing of media printed by ink jet printing. The method involves determining the maximum allowable ink print density necessary to reduce or eliminate paper cockleing in t ...