Nasser M Alavizadeh

US Patent:

7121658, Oct 17, 2006

Filed:

Jan 7, 2004

Appl. No.:

10/753042

Inventors:

David P. Platt - Sherwood OR, US
Nasser Alavizadeh - Tigard OR, US
Michael F. Deily - Lake Oswego OR, US

Assignee:

Xerox Corporation - Stamford CT

International Classification:

B41J 2/175

US Classification:

347 87, 347 93

Abstract:

A print head reservoir for use in an ink jet printer includes a body, an ink bucket, and a filter. The body defines an ink cavity. The cavity includes a cavity inlet, a cavity outlet and a vent positioned above the cavity inlet for bleeding air from the ink cavity. The ink bucket attaches to the body. The ink bucket communicates with the cavity via the cavity inlet. The filter is disposed in the cavity dividing the cavity into an upstream filter cavity and a downstream filter cavity.

US Patent:

8092000, Jan 10, 2012

Filed:

Jan 19, 2009

Appl. No.:

12/355965

Inventors:

Nasser Alavizadeh - Tigard OR, US
Christopher Jon Laharty - Oregon City OR, US
Chad Johan Slenes - Sherwood OR, US

Assignee:

Xerox Corporation - Norwalk CT

International Classification:

B41J 2/175

US Classification:

347 88, 219552, 338331, 347 62

Abstract:

A heater for use in a phase change ink printhead reservoir is provided that includes a first insulating layer having at least one ink supply path opening, and a second insulating layer having at least one ink supply path opening that aligns with the at least one ink supply path opening in the first insulating layer. The heater includes a resistance heating trace arranged in a serpentine pattern between the first and the second insulating layers. The resistance heating trace is configured to receive electric current and to convert the electric current to heat. The resistance heating trace includes a trace ring for each ink supply path opening in the first and second insulating layers that forms a continuous perimeter around the corresponding ink supply path opening.

US Patent:

8550611, Oct 8, 2013

Filed:

Jan 9, 2012

Appl. No.:

13/346142

Inventors:

Nasser Alavizadeh - Tigard OR, US
Christopher Jon Laharty - Oregon City OR, US
Chad Johan Slenes - Sherwood OR, US

Assignee:

Xerox Corporation - Norwalk CT

International Classification:

B41J 2/175

US Classification:

347 88, 219552, 338331, 347 62

Abstract:

A heater for use in a phase change ink printhead reservoir is provided that includes a first insulating layer having at least one ink supply path opening, and a second insulating layer having at least one ink supply path opening that aligns with the at least one ink supply path opening in the first insulating layer. The heater includes a resistance heating trace arranged in a serpentine pattern between the first and the second insulating layers. The resistance heating trace is configured to receive electric current and to convert the electric current to heat. The resistance heating trace includes a trace ring for each ink supply path opening in the first and second insulating layers that forms a continuous perimeter around the corresponding ink supply path opening.

US Patent:

54247675, Jun 13, 1995

Filed:

Mar 2, 1993

Appl. No.:

8/025292

Inventors:

Nasser Alavizadeh - Tigard OR
Douglas M. Stanley - Hillsboro OR
Bryan F. Johnson - Aloha OR

Assignee:

Tektronix, Inc. - Wilsonville OR

International Classification:

B41J 2938

US Classification:

347 17

Abstract:

A multiple-orifice phase-change ink-jet print head (28, 44) is heated by a composite laminate heater (29, 58) having multiple heating zones (31-31K, Z1-Z28) spanning the X- and Y-directions of the print head. The print head has multiple rows of ink-jet orifices (34, 46) spread across its face in the Y-direction with the ink in each orifice in each row requiring substantially the same temperature to ensure a uniform jetting velocity from every orifice. In one embodiment, the print head is in fluid communication with a thermally massive multicolor ink reservoir (52) that conducts heat through a region of contact (92) with the print head. A rotating drum (32), spaced across a gap (90) from the print head, draws air through the gap thereby cooling the print head differentially in the Y-direction. Radiation and convection are further thermal transfer mechanisms that contribute to a nonuniform temperature throughout the print heads. The heating zones of the print head heaters compensate for the various thermal transfer mechanisms to cause a uniform temperature throughout the print heads.

US Patent:

6003971, Dec 21, 1999

Filed:

Mar 6, 1996

Appl. No.:

8/610564

Inventors:

David W. Hanks - Portland OR
Meade Neal - Mulino OR
Sharon S. Berger - Salem OR
Donald B. Maclane - Portland OR
Nasser Alavizadeh - Tigard OR
Ronald F. Burr - Wilsonville OR
William H. Tomison - Beaverton OR

Assignee:

Tektronix, Inc. - Wilsonville OR

International Classification:

B41J 221
B41J 2045
A47J 2700
H05B 100

US Classification:

347 43

Abstract:

An ink jet array print head (101) includes four media-width linear ink jet arrays (100). Ink flows from four sets of manifolds (106) through acoustically matched inlet filters (116), inlet ports (117), inlet channels (118), pressure chamber ports (120), and ink pressure chambers (122). Ink leaves the pressure chambers through outlet ports (124) and flows through oval outlet channels (128) to orifices (108), from which ink drops (110) are ejected. The ink pressure chambers are bounded by flexible diaphragms (130) to which piezo-ceramic transducers (132) are bonded. To minimize inter-jet cross-talk caused by pressure fluctuations in the manifolds, compliant walls (150) form one wall along the entire length of each manifold. An improved ink feed system (210) supplies four colors of ink to the print head. Phase-change inks are melted and deposited in ink catch basins (202), funneled into ink storage reservoirs (204), and fed to the print head through ink stack feeds (206) having substantially equal lengths and cross-sectional areas to improve jetting uniformity.

US Patent:

20190114517, Apr 18, 2019

Filed:

Oct 17, 2017

Appl. No.:

15/786076

Inventors:

- Norwalk CT, US
ERIC HYDE - PORTLAND OR, US
WALTER SEAN HARRIS - PORTLAND OR, US
BRIAN J. DANIELS - LAKE OSWEGO OR, US
REID W. GUNNELL - WILSONVILLE OR, US
NASSER ALAVIZADEH - TIGARD OR, US
LISA M. SCHMIDT - PORTLAND OR, US
ROBERT MARK JACOBS - TIGARD OR, US

International Classification:

G06K 15/12
B41J 29/393

Abstract:

A method of correcting print banding in a printer, including initiating the banding correction process, generating prints with various levels of banding based on different levels of voltages applied to the array of jets, receiving an input from the user selecting the preferred print, and adjusting voltage levels applied to jets corresponding to the preferred print.

US Patent:

20180170041, Jun 21, 2018

Filed:

Feb 15, 2018

Appl. No.:

15/898129

Inventors:

- NORWALK CT, US
GAUTAM DHAR - TIGARD OR, US
DAVID LYLELL KNIERIM - WILSONVILLE OR, US
CHAD DAVID FREITAG - PORTLAND OR, US
JONATHAN ROBERT BRICK - TUALATIN OR, US
DOUGLAS DEAN DARLING - PORTLAND OR, US
NASSER ALAVIZADEH - TIGARD OR, US
BRADFORD STEWART - VANCOUVER WA, US
WILLIAM BRUCE WEAVER - CANBY OR, US

International Classification:

B41J 2/045
B41J 2/175
B41J 2/17

Abstract:

A print head has a jet stack, a jet stack heating and temperature measuring element thermally connected to the jet stack, the jet stack heating and temperature measuring element including: a first, etched copper layer having heat spreading characteristics and including a resistive heat source electrically connected in series to a voltage source and a switch; an electrically insulative on a back side of the first copper layer; and a second, etched copper layer on a side of the electrically insulative layer opposite the first copper layer, the second copper layer having a temperature sensing element to sense a temperature of the print head without a thermistor, the temperature sensing element connected in series with a voltage source and a transistor. A print head may use a thermistor but the heat spreading layer eliminates the need for a heat sink to attach to the print head.

US Patent:

20150054878, Feb 26, 2015

Filed:

Aug 22, 2013

Appl. No.:

13/973794

Inventors:

- Norwalk CT, US
Gautam Dhar - Tigard OR, US
David Lyell Knierim - Wilsonville OR, US
Chad David Freitag - Portland OR, US
Jonathan Robert Brick - Tualatin OR, US
Douglas Dean Darling - Portland OR, US
Nasser Alavizadeh - Tigard OR, US
Bradford Stewart - Vancouver WA, US
William Bruce Weaver - Canby OR, US

Assignee:

XEROX CORPORATION - Norwalk CT

International Classification:

B41J 2/045

US Classification:

347 17

Abstract:

Print head jet stack heating and temperature measurement systems and methods are disclosed that both heat the jet stack and determine a temperature of the jet stack. The heating and temperature determination are performed by a flex circuit that includes multiple layers. One of the layers heats the jet stack and another one of the layers provides data that determines the temperature of the jet stack. The heating layer and the temperature sensing layer are separated by an insulative material in the flex circuit. The temperature of the jet stack can be sent to a print head controller that then determines whether to increase or decrease the temperature of the jet stack.