Assignee
WELKER ENG
US55 patents
Top patents by PatentIndex Score
US4631967ADec 30, 1986
Automatic insertion device
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US6964517B2Nov 15, 2005
Temperature probe and insertion device
WELKER ENG37 citations93
US6827486B2Dec 7, 2004
Temperature probe and insertion device
WELKER ENG28 citations93
US6338359B1Jan 15, 2002
Dual automatic insertion device
WELKER ENG54 citations93
US6259523B1Jul 10, 2001
Optical inspection insertion apparatus for pressurized vessels
WELKER ENG28 citations93
US6091489AJul 18, 2000
Optical inspection apparatus for pressurized vessels
WELKER ENG18 citations93
US6085777AJul 11, 2000
Dual cylinder insertion apparatus
WELKER ENG28 citations93
US5945611AAug 31, 1999
Dual piston flow-through sampler
WELKER ENG19 citations93
US5579803ADec 3, 1996
Chromatograph protection device
WELKER ENG23 citations93
US5213586AMay 25, 1993
Vent check valve
WELKER ENG25 citations93
US4928536AMay 29, 1990
Fluid sample apparatus featuring integral construction with a motor driven sampling system
WELKER ENG27 citations93
US4922764AMay 8, 1990
Constant pressure sample cylinder with spheroid mixer
WELKER ENG31 citations93
US4628750ADec 16, 1986
Integrated pump and sample vessel
WELKER ENG26 citations93
US4459865AJul 17, 1984
Constant pressure cylinder with vortex mixer
WELKER ENG27 citations93
US6289934B1Sep 18, 2001
Flow diffuser
WELKER ENG26 citations92
US6250330B1Jun 26, 2001
Diaphragm regulator with removable diffuser
WELKER ENG25 citations92
US6092519AJul 25, 2000
Heated sample container case and method
WELKER ENG29 citations92
US5924673AJul 20, 1999
Method and apparatus for quieting turbulence in a gas flow line valve
WELKER ENG17 citations92
US5769388AJun 23, 1998
Flow diffuser and valve
WELKER ENG31 citations92
US5730416AMar 24, 1998
Method and apparatus for quieting turbulence in a gas flow line valve
WELKER ENG32 citations92
US5307830AMay 3, 1994
Flow distribution method and apparatus reducing downstream turbulence
WELKER ENG50 citations92
US4557151ADec 10, 1985
Sampler incorporating pressure balanced check valve
WELKER ENG41 citations92
US4525127AJun 25, 1985
Fluid pump mechanism
WELKER ENG42 citations92
US7156123B2Jan 2, 2007
Pressure reduction system for quick-connects
WELKER ENG32 citations91
US7194920B2Mar 27, 2007
Sensor probe and pipeline construction and method
WELKER ENG12 citations84
US6761757B2Jul 13, 2004
Instrument probe with valve and separator
WELKER ENG15 citations84
US6439267B2Aug 27, 2002
Adjustable flow diffuser
WELKER ENG16 citations84
US6422737B1Jul 23, 2002
Liquid sample cylinder with integral mixing pump
WELKER ENG19 citations84
US5907107AMay 25, 1999
Heated instrument regulator tip
WELKER ENG19 citations84
US4850669AJul 25, 1989
Explosion-proof optical fiber connector for a light source
WELKER ENG20 citations82
US4387592AJun 14, 1983
Probe insertion apparatus
WELKER ENG27 citations82
US6818045B2Nov 16, 2004
Liquid separator with integral sight glass
WELKER ENG10 citations74
US6764536B2Jul 20, 2004
Sampling device with liquid eliminator
WELKER ENG10 citations74
USRE35824EJun 16, 1998
Fluid sample apparatus featuring integral construction with a motor driven sampling system
WELKER ENG12 citations74
US5756906AMay 26, 1998
Stabilized insertion device
WELKER ENG11 citations74
US5578770ANov 26, 1996
Apparatus and method for gas detection
WELKER ENG14 citations74
US5406855AApr 18, 1995
Solenoid actuated sampler
WELKER ENG13 citations74
US5303599AApr 19, 1994
Miniaturized sampler
WELKER ENG15 citations74
US4882939ANov 28, 1989
Purge valve
WELKER ENG7 citations74
US4777567AOct 11, 1988
Optical inspection apparatus
WELKER ENG12 citations74
US4678290AJul 7, 1987
Apparatus for visual inspection of closed machinery
WELKER ENG7 citations74
US4463603AAug 7, 1984
Volume analyzer for crude oil sampling system including bite checking apparatus
WELKER ENG10 citations74
US4463599AAug 7, 1984
Free water volume analyzer
WELKER ENG17 citations74
US4440032AApr 3, 1984
Sampler incorporating a purge system
WELKER ENG16 citations74
US4403519ASep 13, 1983
Sample collection apparatus
WELKER ENG14 citations74
US4403518ASep 13, 1983
Sampler apparatus
WELKER ENG17 citations74
US4942772AJul 24, 1990
Stack sampling system
WELKER ENG14 citations65
US5996425ADec 7, 1999
Vanishing head sample cylinder
WELKER ENG5 citations63
US5769375AJun 23, 1998
Positionable holder for sample cylinder
WELKER ENG6 citations63
US4908567AMar 13, 1990
Power supply system for an optical inspection apparatus
WELKER ENG6 citations63
Showing the top 50 of 55 patents by PatentIndex Score.