Jeffrey A Kahn

US Patent:

48094285, Mar 7, 1989

Filed:

Dec 10, 1987

Appl. No.:

7/131620

Inventors:

James S. Aden - Corvallis OR
Jeffrey A. Kahn - Corvallis OR

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

H01C 1706
H05K 300

US Classification:

29611

Abstract:

A process for manufacturing a thin film resistor substrate useful, for example, in fabricating an ink jet printhead, wherein discontinuous strips of conductive material are initially patterned on the surface of a resistive layer. These strips are formed using a first series of masking and etching steps of define an "X" dimension of a resistive heater element. Then, the conductive strips and resistive material therebetween are completely masked in preparation for a subsequent, second etching step used to remove the exposed portions of the resistive layer and thereby define a "Y" dimension of the resistive heater element. These steps leave smooth contours, good step coverage and high quality bevelled edges of the thus defined conductive and resistive layers. These layers are now ready for subsequent passivation layer, barrier layer and orifice plate deposition processes to complete a thin film printhead for use in an ink jet printer.

US Patent:

54415934, Aug 15, 1995

Filed:

Oct 14, 1994

Appl. No.:

8/323185

Inventors:

Kit C. Baughman - Corvallis OR
Jeffrey A. Kahn - Corvallis OR
Paul H. McClelland - Monmouth OR
Kenneth E. Trueba - Corvallis OR
Ellen R. Tappon - Corvallis OR

Assignee:

Hewlett-Packard Corporation - Palo Alto CA

International Classification:

G01D 1500
B44C 122

US Classification:

216 27

Abstract:

An ink fill slot can be precisely manufactured in a substrate utilizing photolithographic techniques with chemical etching, plasma etching, or a combination thereof. These methods may be used in conjunction with laser ablation, mechanical abrasion, or electromechanical machining to remove additional substrate material in desired areas. The ink fill slots are appropriately configured to provide the requisite volume of ink at increasingly higher frequency of operation of the printhead by means of an extended portion that results in a reduced shelf length and thus reduced fluid impedance imparted to the ink. The extended portion is precisely etched to controllably align it with other elements of the printhead.

US Patent:

53873149, Feb 7, 1995

Filed:

Jan 25, 1993

Appl. No.:

8/009151

Inventors:

Kit C. Baughman - Corvallis OR
Jeffrey A. Kahn - Corvallis OR
Paul H. McClelland - Monmouth OR
Kenneth E. Trueba - Corvallis OR
Ellen R. Tappon - Corvallis OR

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

H01L 21306
B44C 122
C03C 1500
B29C 3700

US Classification:

156643

Abstract:

An ink fill slot can be precisely manufactured in a substrate utilizing photolithographic techniques with chemical etching, plasma etching, or a combination thereof. These methods may be used in conjunction with laser ablation, mechanical abrasion, or electromechanical machining to remove additional substrate material in desired areas. The ink fill slots are appropriately configured to provide the requisite volume of ink at increasingly higher frequency of operation of the printhead by means of an extended portion that results in a reduced shelf length and thus reduced fluid impedance imparted to the ink. The extended portion is precisely etched to controllably align it with other elements of the printhead.

US Patent:

56084366, Mar 4, 1997

Filed:

Oct 14, 1994

Appl. No.:

8/323187

Inventors:

Kit C. Baughman - Corvallis OR
Jeffrey A. Kahn - Corvallis OR
Paul H. McClelland - Monmouth OR
Kenneth E. Trueba - Corvallis OR
Ellen R. Tappon - Corvallis OR

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

B41J 205

US Classification:

347 65

Abstract:

A printhead for an inkjet printer employs an ink fill slot having an extended portion disposed as a depression on the primary surface of the printhead substrate. The barrier layer of the printhead forms the walls of the ink ejection chambers, the walls of and constrictions in the ink fill channels, and the contoured barrier lobes between the ink fill channels. The extended portion of the ink fill slot follows the contour of the barrier lobes such that the length of the substrate shelf between the ink fill channel constriction and the extended portion of the ink fill slot is equalized between ink ejection chambers.