| Patent Number |
Title Of Patent |
Date Issued |
| 6561628 |
Toner projection system |
May 13, 2003 |
| A system for projecting electrically conductive or semi-conductive toner directly on to print media using a direct electrostatic projection printing device that includes a projection control electrode positioned between a reference electrode and an orifice plate. A mechanism is provi |
| 6057867 |
Laser printer with piezoelectric apparatus to reduce banding by adjustment of a scanned laser be |
May 2, 2000 |
| A print apparatus includes a photoconductor and a mechanical system for moving the photoconductor past a scan line exposure station. The print apparatus includes a signal generator for providing outputs indicative of the movement of the photoconductor. A first comparator produces a first |
| 5796422 |
Direct toner projection printing using an intermediate transfer medium |
August 18, 1998 |
| An electrostatic printing apparatus includes a rotating transfer drum having an outer transfer surface. A plurality of direct toner projection units are positioned adjacent the transfer surface of the rotating transfer drum to project toner patterns of different colors onto the trans |
| 5420675 |
Liquid toner fusing/transfer system with a film-forming roller that is absorbent of a low volati |
May 30, 1995 |
| An electrostatic imaging system includes a photoconductor which carries an image defined by a liquid toner. The liquid toner comprises a pigment binder system in a paraffinic solvent blend carrier liquid, the liquid carrier exhibiting a relatively high flash point temperature. The imagin |
| 5121132 |
Ink delivery system for printers |
June 9, 1992 |
| An ink delivery system for an inkjet printer includes a vented supply chamber for providing a reservoir of ink and an ink compartment which is connected to the supply chamber via a hydrophobic membrane which acts as a fluid diode for regulating the flow of ink from the supply chamber int |
| 5113199 |
Ink delivery system for ink jet printers |
May 12, 1992 |
| A system for delivering ink to print heads in thermal ink jet printers includes a liquid compartment with a gas space thereabove at sub-atmospheric pressure, a hydrophobic membrane mounted between the liquid compartment and the surrounding environment for allowing ambient gases to bu |
| 5111302 |
Method and system for enhancing the quality of both color and black and white images produced by |
May 5, 1992 |
| 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 |
| 5107332 |
Method and system for providing closed loop color control between a scanned color image and the |
April 21, 1992 |
| 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, th |
| 5031050 |
Method and system for reproducing monochromatic and color images using ordered dither and error |
July 9, 1991 |
| 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 computat |
| 5016023 |
Large expandable array thermal ink jet pen and method of manufacturing same |
May 14, 1991 |
| 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 pr |
| 4999652 |
Ink supply apparatus for rapidly coupling and decoupling a remote ink source to a disposable ink |
March 12, 1991 |
| 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 c |
| 4930018 |
Method and system for enhancing the quality of both color and black and white images produced by |
May 29, 1990 |
| 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 |
| 4831389 |
Off board ink supply system and process for operating an ink jet printer |
May 16, 1989 |
| 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 wi |
| 4829319 |
Plastic orifice plate for an ink jet printhead and method of manufacture |
May 9, 1989 |
| A plastic orifice plate for an ink jet printhead and manufacturing process therefor which includes electroforming a metal die having raised sections thereon of predefined center-to-center spacings, and using the die to punch out openings in a plastic substrate of a chosen thickness to fo |
| 4812859 |
Multi-chamber ink jet recording head for color use |
March 14, 1989 |
| 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 sing |
| 4791438 |
Balanced capillary ink jet pen for ink jet printing systems |
December 13, 1988 |
| 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 t |
| 4791436 |
Nozzle plate geometry for ink jet pens and method of manufacture |
December 13, 1988 |
| A nozzle plate suitable for use in an ink jet printer and method of manufacturing this plate, which includes forming a plurality of grooves or serrations in the interior orifice bore surfaces of the plate. These grooves or serrations may advantageously be electroformed replications of |
| 4716423 |
Barrier layer and orifice plate for thermal ink jet print head assembly and method of manufactur |
December 29, 1987 |
| This application discloses a thermal ink jet printhead and method of manufacture featuring an improved all-metal orifice plate and barrier layer assembly. This assembly includes constricted ink flow ports to reduce cavitation damage and smooth contoured convergent ink ejection orific |
| 4694308 |
Barrier layer and orifice plate for thermal ink jet printhead assembly |
September 15, 1987 |
| This application discloses a thermal ink jet printhead and method of manufacture featuring an improved all-metal orifice plate and barrier layer assembly. This assembly includes constricted ink flow ports to reduce cavitation damage and smooth contoured convergent ink ejection orific |
| 4675083 |
Compound bore nozzle for ink jet printhead and method of manufacture |
June 23, 1987 |
| The present invention is directed to a compound bore nozzle plate for a thermal ink jet printhead and is manufactured by electroforming nickel onto a nickel substrate which has been masked by a plurality of mask segments of predefined geometry. This geometry consists of a plurality of |
| 4535343 |
Thermal ink jet printhead with self-passivating elements |
August 13, 1985 |
| 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 |
