Geoff C. Gerhardt
40Patents
7h-index
35Co-inventors
69Inventor score
Filing activity: Sep 13, 1999 → Jun 22, 2021
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6557575B1 | Fluid flow control freeze/thaw valve for narrow bore capillaries or microfluidic devices | Emerging Cross-Sectional Technologies | 30 | Expired |
| US6712587B2 | Hydraulic amplifier pump for use in ultrahigh pressure liquid chromatography | Physics | 26 | Expired |
| US7311502B2 | Method for using a hydraulic amplifier pump in ultrahigh pressure liquid chromatography | Physics | 26 | Expired |
| US6413398B1 | Method for electrochemical detection | Physics | 22 | Expired |
| US7909367B2 | Capillary interconnection fitting and method of holding capillary tubing | Physics | 13 | Active |
| US7186336B2 | Flow sensing apparatus | Physics | 12 | Expired |
| US9115815B2 | Variable-volume injection valve | Emerging Cross-Sectional Technologies | 7 | Active |
| US8173070B2 | Sample injector system for liquid chromatography | Emerging Cross-Sectional Technologies | 6 | Active |
| US7674375B2 | Closed loop flow control of a HPLC constant flow pump to enable low-flow operation | Physics | 6 | Expired |
| US7204264B2 | High pressure capillary micro-fluidic valve device and a method of fabricating same | Emerging Cross-Sectional Technologies | 5 | Expired |
| US7332087B2 | Flow sensing apparatus used to monitor/provide feedback to a split flow pumping system | Physics | 4 | Expired |
| US8671975B2 | Compliant-seal check valve | Emerging Cross-Sectional Technologies | 4 | Active |
| US8679333B2 | Closed loop flow control of a HPLC constant flow pump to enable low-flow operation | Physics | 2 | Active |
| US7059185B2 | System and method of measuring convection induced impedance gradients to determine liquid flow rates | Physics | 2 | Expired |
| US8943887B2 | Thermal-based flow sensing apparatuses and methods for high-performance liquid chromatography | Physics | 2 | Active |
| US9304115B2 | Pressure sensing and flow control in diffusion-bonded planar devices for fluid chromatography | Emerging Cross-Sectional Technologies | 2 | Active |
| US8640730B2 | Variable resistance fluid controller | Emerging Cross-Sectional Technologies | 2 | Active |
| US9496125B2 | Interfacing with a digital microfluidic device | Physics | 2 | Active |
| US7841190B2 | Freeze-thaw valve that self-limits cryogenic agent usage | Emerging Cross-Sectional Technologies | 2 | Active |
| US9396916B2 | Electrokinetically controlled calibrant delivery | Electricity | 1 | Active |
| US11105778B2 | Method and apparatus for injecting a chromatographic sample | Physics | 0 | Active |
| US11061003B2 | Method and apparatus for injecting a chromatographic sample | Physics | 0 | Active |
| US11169125B2 | Mass spectrometer ion source with integrated column | Electricity | 0 | Active |
| US11733216B2 | Matching thermally modulated variable restrictors to chromatography separation columns | Physics | 0 | Active |
| US9952186B2 | Pressure sensing and flow control in diffusion-bonded planar devices for fluid chromatography | Emerging Cross-Sectional Technologies | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.