Mark Anthony Parker

US Patent:

6652635, Nov 25, 2003

Filed:

Apr 10, 2002

Appl. No.:

10/120285

Inventors:

Srinivasa D. Rangaraj - Tualatin OR
Mark R. Parker - Portland OR
Jeffrey R. Kohne - Tualatin OR

Assignee:

Xerox Corporation - Stamford CT

International Classification:

C09D 1100

US Classification:

106 3129, 106 3161, 106 3143, 106 3175, 523160, 523161, 524487, 524589

Abstract:

Disclosed is a phase change ink composition comprising (a) a phase change carrier, (b) a cyan colored resin or wax comprising the reaction product of (i) a cyan colorant having at least one functional group selected from (A) hydroxyl groups, (B) primary or secondary amino groups, (C) mercapto groups, or (D) mixtures thereof, and (ii) an isocyanate, and (c) an organic acid selected from (i) organic sulfonic acids, (ii) organic phosphinic acids, (iii) organic phosphonic acids, or (iv) mixtures thereof.

US Patent:

6987588, Jan 17, 2006

Filed:

Jun 25, 2001

Appl. No.:

09/888667

Inventors:

Meng Yao - West Linn OR, US
Michael T. Stevens - Aloha OR, US
Mark R. Parker - Portland OR, US

Assignee:

Xerox Corporation - Stamford CT

International Classification:

H04N 1/40

US Classification:

358 314, 358 306

Abstract:

A method to compensate for dot placement errors includes receiving image data comprising a plurality of pixels, each having at least two states, a first corresponding to depositing no ink and a second corresponding to depositing ink; identifying a stray pixel pattern within the image data, the stray pixel pattern including a stray pixel corresponding to a misplaced dot in a dot pattern; and modifying the image data corresponding to the stray pixel pattern by setting the stray pixel to the first state and changing a second pixel from the first state to the second state.

US Patent:

7040730, May 9, 2006

Filed:

Jan 12, 2004

Appl. No.:

10/756586

Inventors:

Meng Yao - West Linn OR, US
Mark R. Parker - Portland OR, US

Assignee:

Xerox Corporation - Stamford CT

International Classification:

B41J 2/205
G06K 15/00

US Classification:

347 15, 358 12, 358 19, 358534

Abstract:

A method of printing including changing each process black dot and each black plus non-black dot of a halftoned bit map to a black dot, if each of first and second adjacent dots on either side of such process black dot or black plus dot along a predetermined axis comprises a black dot, a black plus non-black dot, a process black dot, or a white dot, and printing the bit map.

US Patent:

7048349, May 23, 2006

Filed:

Jan 12, 2004

Appl. No.:

10/756058

Inventors:

Meng Yao - West Linn OR, US
Mark R. Parker - Portland OR, US

Assignee:

Xerox Corporation - Stamford CT

International Classification:

B41J 2/205
G06K 15/00

US Classification:

347 15, 358 19, 358 12, 358534

Abstract:

A method of printing including replacing each of black dots of a first subset of black dots of a bit map for a predetermined area with a process black dot, adding a non-black dot to each of black dots of a second subset of black dots of the bit-mapped data, and printing the bit map.

US Patent:

57901600, Aug 4, 1998

Filed:

Jan 16, 1996

Appl. No.:

8/582332

Inventors:

Barry D. Reeves - Lake Oswego OR
Loc V. Bui - Beaverton OR
Clark W. Crawford - Wilsonville OR
James D. Rise - West Linn OR
Barry E. Morgan - Clackamas OR
Larry Church - Portland OR
Mark Parker - Portland OR

Assignee:

Tektronix, Inc. - Wilsonville OR

International Classification:

B41J 205

US Classification:

347103

Abstract:

A method and an apparatus for processing an image transparency entails the application of an intermediate transfer surface of a layer of sacrificial liquid to a supporting surface and the deposition of a phase change ink onto the liquid layer. The inked image is then contact transferred to an optically transmissive final receiving substrate, such as a plastic transparency.

US Patent:

56253907, Apr 29, 1997

Filed:

Jan 30, 1995

Appl. No.:

8/381615

Inventors:

Edward F. Burke - Lake Oswego OR
Mark R. Parker - Portland OR
David D. Martenson - Milwaukie OR

Assignee:

Tektronix, Inc. - Wilsonville OR

International Classification:

B41J 2145
B41J 215

US Classification:

347 41

Abstract:

An image transfer ink-jet printer employs an image receiving drum that rotates relative to an ink-jet array print head spanning the full width of the drum. A print head positioner moves the print head in precise increments to position adjacent scan lines of ink drops. Without affecting the overall scale of the image, adjacent pairs of scan lines are spaced at distances less than one nominal pixel width. Pairings within the range of 0. 2 to 0. 5 pixel widths are used, with optimal spacing at 0. 35 pixel widths.

US Patent:

56003528, Feb 4, 1997

Filed:

Jun 27, 1994

Appl. No.:

8/267061

Inventors:

David L. Knierim - Wilsonville OR
Mark R. Parker - Portland OR

Assignee:

Tektronix, Inc. - Wilsonville OR

International Classification:

B41J 2145
B41J 215
B41J 2300

US Classification:

347 40

Abstract:

An image transfer ink-jet printer (10) employs an image receiving drum (12) that rotates relative to a ink-jet array print head (26) spanning the full width of the drum. An encoder disk (70) is coupled to the drum to coordinate ink drop ejection with precise angular rotational increments of the drum. The encoder disk has an alternating transparent/opaque pattern with a pitch that is one-half the desired resolution of the printer. A photo-optical detector (72) senses the alternating pattern and sends an asymmetrical signal to a duty-cycle correction circuit (140) that generates a symmetrical signal having a frequency double the one received from the photo-optical detector. The symmetrical signal is processed by a dot clock circuit (180) that applies programmable time delays to selected ones of the dot clock pulses (122, 124) to produce ink drop positioning patterns (130, 132) that control the coalescence of adjacent ink drops (80) without reducing overall printer resolution or producing undesired image artifacts. The coalesced ink drops (100) have a shape suitable for depositing multiple ink layers that produce well saturated color images in transparency projection applications.