Ronald J Burns

US Patent:

6443568, Sep 3, 2002

Filed:

Jun 29, 2001

Appl. No.:

09/895428

Inventors:

Ronald A. Askeland - San Diego CA
Ronald J. Burns - San Diego CA
Paul J. Bruinsma - San Diego CA

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

B41J 217

US Classification:

347 98, 347100, 347101

Abstract:

Underprinting and/or overprinting clear fixer liquid onto an inkjet printed image, giving time for underprinted fixer to partially dry before depositing the inkjet printed image and/or giving time for the inkjet printed image to dry before overprinting the clear fixer liquid.

US Patent:

6631964, Oct 14, 2003

Filed:

Oct 16, 2001

Appl. No.:

09/981046

Inventors:

Roanld A. Askeland - San Diego CA
Ronald Burns - San Diego CA

Assignee:

Hewlett-Packard Development Company, L.P. - Houston TX

International Classification:

B41J 2205

US Classification:

347 15, 358 19, 358 12, 358429

Abstract:

A system and method of printing allows mapping between an input print data file and an output dot grid data file, wherein the resolution of the resolution of the dot grid is not an integer multiple of the print data. A method includes forming an input print data group of pixels within the print data file and forming an output dot grid group of a different number of pixels within the dot grid data file. The pixels within the input group are associated pixels within the output group by a mapping function. By varying the number of pixels within the two groups, the printhead nozzle firing frequency and the rate of ink deposition per unit area of media may be controlled. Accordingly, print output quality may be maximized given the constraints of the hardware available.

US Patent:

62542176, Jul 3, 2001

Filed:

Jul 29, 1999

Appl. No.:

9/363943

Inventors:

Ronald A Askeland - San Diego CA
Ronald J. Burns - San Diego CA
William S Osborne - Camas WA

Assignee:

Hewlett-Packard Company - Palo ALto CA

International Classification:

B41J 221

US Classification:

347 43

Abstract:

An printing apparatus and method for reducing hue shift due to differing deposition orders of different color ink drops. A differing deposition order occurs in bidirectional inkjet printers with printheads that deposit overlapping drops in a single scan in either a forward or rearward direction. Different print masks for each color ink are used to govern ink drop deposition in the different scan directions in order to vary the deposition order and/or number of drops deposited in a given location. A different mask pattern is applied to a top and bottom set of nozzles corresponding to the print advance height. This technique reduces the perceived difference in color shade between an area of a composite color printed in the forward direction followed by the rearward direction, and an area of the same composite color printed in the rearward direction followed by the forward direction. An inkjet printer constructed in accordance with the present invention minimizes hue shift while still retaining the advantages of multipass bidirectional printing, without the need to reduce throughput or increase the manufacturing cost or complexity of the printer.

US Patent:

20180134048, May 17, 2018

Filed:

Jan 12, 2018

Appl. No.:

15/869997

Inventors:

- Houston TX, US
Lluis Abello - Tarragona, ES
Ronald Burns - San Diego CA, US

Assignee:

HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. - Houston TX

International Classification:

B41J 11/00
B41J 2/21

Abstract:

In some examples herein, control data is for application of treatment fluid on a treatment substrate location surrounding a substrate dot corresponding to a first pixel of the digital image. Treatment fluid is ejected on the treatment substrate location if a metric value computed from pixel values of a set of pixels in the neighborhood of the first pixel is above a threshold level.

Address:

PO Box 99185, San Diego, CA 92169

VIN:

1FAHP35N98W275515

Make:

Ford

Model:

Focus

Year:

2008