Todd A Cleland

US Patent:

6360439, Mar 26, 2002

Filed:

Aug 5, 1998

Appl. No.:

09/130179

Inventors:

Todd A. Cleland - Corvallis OR
Garrard Hume - Corvallis OR

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

B21D 5376

US Classification:

298901, 29611, 298966, 205 75

Abstract:

A method of manufacturing an orifice plate for a fluid ejection device comprises defining a plurality of orifice apertures in a substantially planar plate; and defining a plurality of closed slits in the plate.

US Patent:

6402296, Jun 11, 2002

Filed:

Oct 29, 1998

Appl. No.:

09/183549

Inventors:

Todd A. Cleland - Corvallis OR
Rio Rivas - Corvallis OR
David Pidwerbecki - Corvallis OR

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

B41J 2145

US Classification:

347 40, 347 47

Abstract:

A high resolution printer includes a printhead having optimized features including 12 to 14 micron diameter orifices spaced apart from adjacent orifices by a distance of between 76 to 94 microns. The orifice plate is electroformed and plated to a thickness ranging from 20 to 25 microns. A polymeric barrier layer secures the orifice plate to a printhead substrate.

US Patent:

6478410, Nov 12, 2002

Filed:

Aug 23, 2001

Appl. No.:

09/938189

Inventors:

Rama Prasad - Albany OR
Todd A. Cleland - Corvallis OR
Robert C Maze - Corvallis OR
Dale R. Oughton - Albany OR

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

B41J 205

US Classification:

347 65, 347 94

Abstract:

This present invention is embodied in a low-cost printing system including a printhead and an ink composition that provides photographic-quality resolution. The printhead of the present invention includes a high-density array of drop generators that eject ink drops having a low drop weight and that operate at a high frequency. Further, high-resistance firing resistors are used to provide minimum energy dissipation and the firing resistors are preferably thin-film resistors to ensure that a minimal amount of energy is needed to eject ink drops. The stability of the ink drop volume is maintained by including an overdamped structure within the ink drop generators that allow the ink chambers to fill up with ink slowly. The ink composition of the present invention includes an ink additive that prevents decel from occurring during sustained high-frequency printing bursts.

US Patent:

6491377, Dec 10, 2002

Filed:

Aug 30, 1999

Appl. No.:

09/386015

Inventors:

Todd A. Cleland - Corvallis OR
Robert C. Maze - Corvallis OR
Michael D. Miller - Shedd OR
Rama Prasad - Albany OR
Robert N. K. Browning - Corvallis OR
Dale R. Oughton - Albany OR
Joseph M. Torgerson - Philomath OR
Kenneth D. Saul - Philomath OR
Michael B. Hager - Corvallis OR
Douglas M. Collins - Corvallis OR
Leslie A. Field - Portola Valley CA
Storrs T. Hoen - Brisbane CA
Phillip W. Barth - Portola Valley CA

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

B41J 205

US Classification:

347 50, 347 62, 347 64, 347 58

Abstract:

A high quality inkjet printhead includes a substrate having a multiplicity of heater resistors formed thereon at a density of at least six heater resistors per square millimeter. Each of the heater resistors also has a total resistance of at least 70 and an overlaying passivation thermal barrier characteristic adjusted to enable ejection of an ink drop of less than 6. 5 ng with an energy impulse equal to or less than 1. 4 joules.

US Patent:

6536878, Mar 25, 2003

Filed:

Jun 12, 2001

Appl. No.:

09/880543

Inventors:

Vladek P. Kasperchik - Covallis OR
Kenneth W. Peterson - Corvallis OR
Todd A. Cleland - Corvallis OR
Robert C. Maze - Corvallis OR

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

B41J 205

US Classification:

347 65, 347 94

Abstract:

This present invention is embodied in a low-cost printing system including a printhead and an ink composition that provides photographic-quality resolution. The printhead of the present invention includes a high-density array of drop generators that eject ink drops having a low drop weight and that operate at a high frequency. Further, high-resistance firing resistors are used to provide minimum energy dissipation and the firing resistors are preferably thin-film resistors to ensure that a minimal amount of energy is needed to eject ink drops. The stability of the ink drop volume is maintained by including an overdamped structure within the ink drop generators that allow the ink chambers to fill up with ink slowly. The ink composition of the present invention includes an ink additive that prevents decel from occurring during sustained high-frequency printing bursts.

US Patent:

6594899, Jul 22, 2003

Filed:

Feb 14, 2001

Appl. No.:

09/783895

Inventors:

Robert C. Maze - Corvallis OR
Todd A. Cleland - Corvallis OR
Arun K. Agarwal - Corvallis OR
Mark A. Buonanno - Sunnyvale CA

Assignee:

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

International Classification:

B21D 5376

US Classification:

298901, 29611, 29825, 2961001, 2960307, 2960311, 2960313, 347 62, 347 59

Abstract:

An inkjet printing device employs an inkjet printhead with a plurality of drop generators to eject drops of ink. Each drop generator includes a planar heater resistor, a protection layer having a first heating surface on the heater resistor and a second heating surface entirely surrounding the first heater surface on the heater resistor, and an ink ejection nozzle. The drop generator vaporizes ink at the first heating surface and ejects a drop of ink of a first mass from the nozzle when a first range of energies is applied to the heater resistor. The drop generator vaporizes ink at the first heating surface and the second heating surface and ejects a drop of ink of a second mass from the nozzle when a second range of energies is applied to the heater resistor.

US Patent:

6662435, Dec 16, 2003

Filed:

Oct 5, 2000

Appl. No.:

09/680658

Inventors:

Robert C. Maze - Corvallis OR
Douglas M. Collins - Corvallis OR
Todd A. Cleland - Corvallis OR
Leslie A. Field - Portola Valley CA
Storrs T. Hoen - Brisbane CA
Phillip W. Barth - Portola Valley CA

Assignee:

Hewlett-Packard Development Company, LP - Houston TX

International Classification:

H05B 316

US Classification:

29611, 298901, 438 21

Abstract:

A method of manufacturing an ink jet print head with a substrate defining an ink aperture. A number of ink energizing elements are located on the major surface of the substrate. A barrier layer is connected to the upper surface, and peripherally encloses an ink manifold. The barrier encompasses the ink aperture. An orifice plate is connected to the barrier layer, spaced apart from the substrates major surface, enclosing the ink manifold. The plate defines a number of orifices, each associated with a respective ink energizing element. The ink manifold is an elongated chamber having opposed ends defined by end wall portions of the barrier layer. The barrier end wall portions each have an intermediate end wall portion protruding into the manifold.

US Patent:

6799822, Oct 5, 2004

Filed:

Oct 7, 2002

Appl. No.:

10/266163

Inventors:

Todd A. Cleland - Corvallis OR
Robert C. Maze - Corvallis OR
Michael D. Miller - Shedd OR
Rama Prasad - Albany OR
Robert N. K. Browning - Corvallis OR
Dale R. Oughton - Albany OR
Joseph M. Torgerson - Philomath OR
Kenneth D. Saul - Philomath OR
Michael B. Hager - Corvallis OR
Douglas M. Collins - Corvallis OR
Leslie A. Field - Portola Valley CA
Storrs Hoen - Brisbane CA
Phillip W. Barth - Portola Valley CA

Assignee:

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

International Classification:

B41J 2938

US Classification:

347 12, 347 58

Abstract:

A fluid ejection device includes a substrate, drop generators formed on the substrate at a high density, primitive select lines, and a ground line. The drop generators are arranged in primitives of drop generators. Each drop generator includes a heater resistor having a high resistance. Each primitive select line is separately electrically coupled to a corresponding one of the primitives and is configured to connect to a power source. The ground line is electrically coupled to all of the primitives.