1
Bruce Murdock, Daniel G Teichmer: Touch panel. Tektronix, John D Winkelman, David P Petersen, July 14, 1987: US04680429 (184 worldwide citation)

A touch panel has panel scanning signals selectively applied to the four sides of a touch sensing surface of the panel so as to establish alternating current voltage gradients in desired directions across the touch sensing surface. When the panel is touched, touch currents result and are utilized by ...


2
Philip T Krein, Robert D Meadows, Bruce Murdock, Daniel G Teichmer: Touch panel with automatic nulling. Tektronix, John D Winkelman, David P Petersen, November 17, 1987: US04707845 (114 worldwide citation)

A touch panel has panel scanning signals selectively applied to the four sides of a touch sensing surface of the panel so as to establish alternating current voltage gradients in desired directions across the touch sensing surface. When the panel is touched, touch signals result and are utilized by ...


3
Philip T Krein, Robert D Meadows, Bruce Murdock, Daniel G Teichmer: Touch panel system. Tektronix, John D Winkelman, David P Petersen, October 6, 1987: US04698460 (99 worldwide citation)

A touch panel has panel scanning signals selectively applied to the four sides of a touch sensing surface of the panel so as to establish alternating current voltage gradients in desired directions across the touch sensing surface. When the panel is touched, touch signals or currents result and are ...


4
Martin D Rosback: Ink cartridge manufacturing method and apparatus. Tektronix, John D Winkelman, David P Petersen, Francis I Gray, February 4, 1986: US04568954 (85 worldwide citation)

An ink cartridge 10 is described with a rigid, hollow housing 12 within which an ink container assembly is positioned. The assembly includes an ink container 16 mounted, as by heat sealing, directly to an ink container support 18. The support 18 is secured by fasteners 24 to a cap 14 of the housing ...


5
Rodney M Stephens: Ink jet cartridges and ink cartridge mounting system. Tektronix, David P Petersen, Robert S Hulse, March 6, 1990: US04907019 (73 worldwide citation)

An improved ink cartridge mounting system for a primary ink jet printer including an ink cartridge mounting element having four cartridge receiving openings, each specially configured to receive an ink cartridge containing ink of a particular color. A unique arrangement of six ribs extends from the ...


6
Robert D Meadows, Philip T Krein, Bruce Murdock: Touch panel with automatic frequency control. Tektronix, John D Winkelman, David P Petersen, October 6, 1987: US04698461 (70 worldwide citation)

A touch panel has panel scanning signals selectively applied to the four sides of a touch sensing surface of the panel so as to establish alternating current voltage gradients in desired directions across the touch sensing surface. When the panel is touched, touch signals result and are utilized by ...


7
Hue P Le, Jeffrey J Anderson, Guenther W Wimmer, Monte J Rhoads, Ted E Deur: Method and apparatus for purging an ink jet head. Tektronix, John D Winkelman, David P Petersen, February 23, 1988: US04727378 (43 worldwide citation)

An ink jet head 10 has an ink chamber 14 which receives ink from an ink inlet passageway 38. Pressure pulses applied to the ink chamber cause the ejection of ink drops from an ink drop forming orifice 23 and toward printing medium. A purging outlet 41 communicates with the ink chamber through a purg ...


8
Hue P Le, Joy Roy, Ronald L Adams, James C Oswald, Jeffery J Anderson: Air assisted ink jet head with single compartment ink chamber. Tektronix, John D Winkelman, David P Petersen, March 1, 1988: US04728969 (41 worldwide citation)

An air-assisted drop-on-demand ink jet head 10 has a single compartment ink chamber 14 and is designed for operation over a wide range of ink drop repetition rates, including extremely high repetition rates, such as twenty kilohertz. The components included in the ink jet head have natural resonance ...


9
Cornelis T Veenendaal: Integrated circuit probe parallelism establishing method and apparatus. Tektronix, William S Lovell, David P Petersen, June 14, 1988: US04751457 (40 worldwide citation)

A probe mount carries a probe with test points having ends in a test point plane. The probe mount is supported at three spaced apart locations by respective first, second and third supports, each adjacent to a respective one of the test points. These probe supports permit independent shifting of eac ...


10
Hue P Le, Charles W Jaeger, James C Oswald: Air assisted ink jet head with projecting internal ink drop-forming orifice outlet. Tektronix, John D Winkelman, David P Petersen, September 23, 1986: US04613875 (37 worldwide citation)

An air assisted drop-on-demand ink jet head 10 has an ink chamber with an ink drop-forming orifice outlet 23 from which ink drops are generated in response to pressure waves caused by a piezoelectric crystal 56. The ink drops are carried by air outwardly through an external orifice 24 and toward pri ...