1
Vernon R Natwick, Michael W Lawless, Joseph E Doll, Chung You C Wu: Detecting occlusion of proximal or distal lines of an IV pump. Abbott Laboratories, Christensen O Connor Johnson & Kindness, May 26, 1992: US05116203 (110 worldwide citation)

A method and apparatus for detecting proximal and distal occlusions of flexible tubing in a positive displacement pump. A volumetric pump (30) includes a motor (146) that rotatably drives a cam assembly (142). The rotating cam assembly actuates a plunger (48), causing it to compress a pumping portio ...


2
Vernon R Natwick, Michael W Lawless: Sensor for detecting fluid flow from a positive displacement pump. Abbott Laboratories, Christensen O Connor Johnson & Kindness, August 13, 1991: US05039279 (69 worldwide citation)

A flow detector for use in a volumetric pump to determine if fluid is being displaced by the pump. The volumetric pump (30) includes an inlet cracking valve (46) and an outlet cracking valve (52) disposed on opposite sides of a plunger (48) used to displace fluid by compressing flexible tubing (34). ...


3
Vernon R Natwick, Michael W Lawless: Volumetric pump with spring-biased cracking valves. Abbott Laboratories, Christensen O Connor Johnson & Kindness, October 8, 1991: US05055001 (58 worldwide citation)

A volumetric pump and method for displacing a predetermined quantity of fluid at a predefined cracking pressure, independent of supply and output pressures. The volumetric pump (30) includes an inlet cracking valve (46), an outlet cracking valve (52), and a plunger (48) for displacing fluid from a p ...


4
Vernon R Natwick: Ball launcher with finger spin loading. Ramtek Corporation, Philip M Shaw Jr, January 29, 1980: US04185824 (47 worldwide citation)

An arcade amusement gun for pneumatically shooting rubber balls toward a hollow target from which the balls are automatically returned to the gun, including apparatus for automatically loading one ball at a time from beneath the gun into the gun breech and apparatus for artificially producing a reco ...


5
Vernon R Natwick, Michael W Lawless: Volumetric pump tube reshaper and method. Abbott Laboratories, Christensen O Connor Johnson & Kindness, June 21, 1994: US05322422 (42 worldwide citation)

A volumetric pump and method for displacing a predetermined quantity of fluid at a predefined cracking pressure, independent of supply and output pressures. The volumetric pump (30) includes an inlet cracking valve (46), an outlet cracking valve (52), and a plunger (48)for displacing fluid from a pu ...


6
Vernon R Natwick, Michael W Lawless: Volumetric pump with spring-biased cracking valves. Abbott Laboratories, Christensen O Connor Johnson & Kindness, October 27, 1992: US05158437 (39 worldwide citation)

A volumetric pump and method for displacing a predetermined quantity of fluid at a predefined cracking pressure, independent of supply and output pressures. The volumetric pump (30) includes an inlet cracking valve (46), an outlet cracking valve (52), and a plunger (48) for displacing fluid from a p ...


7
Vernon R Natwick, Michael W Lawless, Joseph E Doll, Chung You C Wu: Method for monitoring fluid flow from a volumetric pump. Abbott Laboratories, Christensen O Connor Johnson & Kindness, January 19, 1993: US05180287 (29 worldwide citation)

A method for determining if fluid is being displaced by a volumetric pump. The volumetric pump (30) includes an inlet cracking valve (46) and an outlet cracking valve (52) disposed on opposite sides of a plunger (48) used to displace fluid by compressing flexible tubing (34). During a pumping segmen ...


8
Vernon R Natwick: Targets and gated firing guns for propelling balls thereto. Ramtek Corporation, Limbach Limbach & Sutton, August 5, 1980: US04215867 (27 worldwide citation)

An arcade amusement gun of the type which pneumatically shoots a rubber ball toward a hollow target with each pull of the trigger is gated by a master control so that its firing rate is the same as the other arcade amusement guns in a grouping of such guns.


9
Michael W Lawless, Vernon R Natwick: Spring-biased valve for use in a positive displacement volumetic pump. Abbott Laboratories, Christensen O Connor Johnson & Kindness, January 7, 1992: US05078362 (26 worldwide citation)

A "cracking valve" for use in a volumetric pump. A volumetric pump (30) includes a plunger (48) for compressing a pumping portion (34b) of a flexible tubing that extends through the pump. An inlet cracking valve (46) and an outlet cracking valve (52) are disposed so that they compress the flexible t ...


10
Vernon R Natwick, Michael W Lawless: Torque compensated cam assembly and method. Abbott Laboratories, Christensen O Connor Johnson & Kindness, October 25, 1994: US05357827 (19 worldwide citation)

A cam assembly and method for providing a substantially constant load to a motor that drives the cam assembly. A torque compensated cam assembly (142,300) includes a plurality of tracks (140,150,152/310,312,314) that are profiled with a surface that varies radially as the cam rotates, thereby actuat ...