Welker Engineering Company
56Patents
0Active
56Granted
37Portfolio score
Filing activity: Jan 5, 1981 → Mar 30, 2005
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4631967A | Automatic insertion device | Physics | 50 | Expired |
| US4525127A | Fluid pump mechanism | Physics | 33 | Expired |
| US4557151A | Sampler incorporating pressure balanced check valve | Physics | 31 | Expired |
| US7156123B2 | Pressure reduction system for quick-connects | Emerging Cross-Sectional Technologies | 26 | Expired |
| US6338359B1 | Dual automatic insertion device | Emerging Cross-Sectional Technologies | 25 | Expired |
| US4628750A | Integrated pump and sample vessel | Physics | 22 | Expired |
| US5769388A | Flow diffuser and valve | Emerging Cross-Sectional Technologies | 21 | Expired |
| US6964517B2 | Temperature probe and insertion device | Physics | 21 | Expired |
| US4928536A | Fluid sample apparatus featuring integral construction with a motor driven sampling system | Physics | 21 | Expired |
| US5307830A | Flow distribution method and apparatus reducing downstream turbulence | Emerging Cross-Sectional Technologies | 21 | Expired |
| US6085777A | Dual cylinder insertion apparatus | Emerging Cross-Sectional Technologies | 20 | Expired |
| US6827486B2 | Temperature probe and insertion device | Physics | 19 | Expired |
| US4387592A | Probe insertion apparatus | Physics | 17 | Expired |
| US4922764A | Constant pressure sample cylinder with spheroid mixer | Emerging Cross-Sectional Technologies | 17 | Expired |
| US5213586A | Vent check valve | Emerging Cross-Sectional Technologies | 16 | Expired |
| US4850669A | Explosion-proof optical fiber connector for a light source | Physics | 16 | Expired |
| US4459865A | Constant pressure cylinder with vortex mixer | Emerging Cross-Sectional Technologies | 16 | Expired |
| US5924673A | Method and apparatus for quieting turbulence in a gas flow line valve | Emerging Cross-Sectional Technologies | 15 | Expired |
| US4403518A | Sampler apparatus | Physics | 15 | Expired |
| US6250330A | Diaphragm regulator with removable diffuser | Emerging Cross-Sectional Technologies | 15 | Expired |
| US6259523A | Optical inspection insertion apparatus for pressurized vessels | Mechanical Engineering; Lighting; Heating | 15 | Expired |
| US4440032A | Sampler incorporating a purge system | Physics | 14 | Expired |
| US6092519A | Heated sample container case and method | Mechanical Engineering; Lighting; Heating | 14 | Expired |
| US5730416A | Method and apparatus for quieting turbulence in a gas flow line valve | Emerging Cross-Sectional Technologies | 14 | Expired |
| US4463599A | Free water volume analyzer | Physics | 12 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.