David G Hurst

US Patent:

6398347, Jun 4, 2002

Filed:

Jul 24, 2000

Appl. No.:

09/626367

Inventors:

Joseph M. Torgerson - Philomath OR
David M. Hurst - Corvallis OR

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

B41J 205

US Classification:

347 58, 257368

Abstract:

An ink jet printhead having FET drive circuits that are configured to compensate for power trace parasitic resistances.

US Patent:

6402279, Jun 11, 2002

Filed:

Oct 30, 2000

Appl. No.:

09/702141

Inventors:

Joseph M. Torgerson - Philomath OR
Bruce Cowger - Corvallis OR
David M. Hurst - Corvallis OR
Mark H. MacKenzie - Corvallis OR

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

B41J 2938

US Classification:

347 12, 347 9, 347 57

Abstract:

The present disclosure relates to an inkjet printhead having a plurality of drop generators that selectively eject ink in response to activation. The inkjet printhead includes first and second drop generators disposed on the printhead. Each of the first and second drop generators are configured for connection to a source of drive current. The inkjet printhead also includes a control device configured for connection to a periodic address signal and first and second periodic enable signals. The control device is responsive to the first periodic enable signal and periodic address signal for enabling the first drop generator for activation in response to drive current. The control device is responsive to the second periodic enable signal and periodic address signal for enabling the second drop generator for activation in response to drive current.

US Patent:

6481817, Nov 19, 2002

Filed:

Oct 30, 2000

Appl. No.:

09/702231

Inventors:

Joseph M. Torgerson - Philomath OR
Bruce Cowger - Corvallis OR
David M. Hurst - Corvallis OR
Mark H. MacKenzie - Corvallis OR

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

B41J 2938

US Classification:

347 12, 347 15

Abstract:

The present disclosure relates to an inkjet printhead having a plurality of drop generators responsive to drive current and address signals for dispensing ink. The inkjet printhead includes first and second drop generators disposed on the printhead with each of the first and second drop generators configured to receive drive current from a drive current source. Each of the first and second drop generators is configured to receive address signals from a common address source. The inkjet printhead further includes a switching device connected between the common address source and each of the first and second drop generators. The switching device is responsive to enable signals for selectively providing the address signal to only one of the first and second drop generators.

US Patent:

6582042, Jun 24, 2003

Filed:

Oct 30, 2000

Appl. No.:

09/702267

Inventors:

Joseph M. Torgerson - Philomath OR
Bruce Cowger - Corvallis OR
David M. Hurst - Corvallis OR
Mark H. MacKenzie - Corvallis OR

Assignee:

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

International Classification:

B41J 2938

US Classification:

347 12

Abstract:

The present disclosure relates to an inkjet printing system that includes an inkjet printhead having a plurality of electrical contacts. The plurality of electrical contacts include address contacts and enable contacts for enabling drop generators and drive current contacts for providing drive current to enable drop generators for selectively ejecting ink therefrom. The printing system includes a printing device having a plurality of electrical contacts including address contacts, enable contacts and drive current contacts. The plurality of electrical contacts are configured to establish electrical contact with corresponding electrical contacts on the inkjet printhead upon insertion of the inkjet printhead into the printing device. The printing device provides periodic address signals and enable signals to the address and enable contacts one the printhead. In addition, the printing device selectively applies drive current to accomplish forming images on print media.

US Patent:

6644788, Nov 11, 2003

Filed:

May 6, 2002

Appl. No.:

10/139707

Inventors:

Joseph M. Torgerson - Philomath OR
David M. Hurst - Corvallis OR

Assignee:

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

International Classification:

B41J 205

US Classification:

347 59

Abstract:

An ink jet printhead having FET drive circuits that are configured to compensate for power trace parasitic resistances.

US Patent:

6698857, Mar 2, 2004

Filed:

May 7, 2003

Appl. No.:

10/430950

Inventors:

Joseph M. Torgerson - Philomath OR
Bruce Cowger - Corvallis OR
David M. Hurst - Corvallis OR
Mark H. MacKenzie - Corvallis OR

Assignee:

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

International Classification:

B41J 2938

US Classification:

347 12, 347 57, 347 58

Abstract:

The present disclosure relates to an inkjet printing system that includes an inkjet printhead having a plurality of electrical contacts. The plurality of electrical contacts include address contacts and enable contacts for enabling drop generators and drive current contacts for providing drive current to enable drop generators for selectively ejecting ink therefrom. The printing system includes a printing device having a plurality of electrical contacts including address contacts, enable contacts and drive current contacts. The plurality of electrical contacts are configured to establish electrical contact with corresponding electrical contacts on the inkjet printhead upon insertion of the inkjet printhead into the printing device. The printing device provides periodic address signals and enable signals to the address and enable contacts one the printhead. In addition, the printing device selectively applies drive current to accomplish forming images on print media.

US Patent:

63090538, Oct 30, 2001

Filed:

Jul 24, 2000

Appl. No.:

9/621922

Inventors:

Joseph M. Torgerson - Philomath OR
David M. Hurst - Corvallis OR

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

B41J 205

US Classification:

347 59

Abstract:

An ink jet printhead having a ground bus that partially overlies active regions of FET drive circuits.