Issued Patents All Time
Showing 1–17 of 17 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6640908 | Apparatus and method for formation testing while drilling with minimum system volume | John M. Michaels, Jaedong Lee, Matthias Meister, Volker Krueger | 2003-11-04 |
| 6609568 | Closed-loop drawdown apparatus and method for in-situ analysis of formation fluids | Volker Krueger, Matthias Meister, John M. Michaels, Jaedong Lee | 2003-08-26 |
| 6478096 | Apparatus and method for formation testing while drilling with minimum system volume | John M. Michaels, Jaedong Lee, Matthias Meister, Volker Krueger | 2002-11-12 |
| 5553034 | Differential pressure fluid density instrument | Daniel T. Georgi | 1996-09-03 |
| 5237854 | Unsteady-state profile permeameter - method and apparatus | — | 1993-08-24 |
| 4864846 | Self-cleaning poppet valve for a core testing apparatus | — | 1989-09-12 |
| 4856967 | Hybrid high pressure pump for gas-liquid permeameters | — | 1989-08-15 |
| RE32964 | System for measuring the pore volume and permeability of very tight core plugs and method therefor | — | 1989-06-27 |
| 4776201 | Method and apparatus for calibrating a differential pressure transducer | — | 1988-10-11 |
| 4660413 | Apparatus and method for determining fluid viscosity and density | — | 1987-04-28 |
| 4649737 | Apparatus and method for automatic testing of core samples | — | 1987-03-17 |
| 4643019 | Porous end plug disk for testing core samples | — | 1987-02-17 |
| 4627270 | System for measuring the pore volume and permeability of very tight core plugs and method therefor | — | 1986-12-09 |
| 4573342 | Apparatus and method for the automatic porosity and permeability testing of multiple core samples | — | 1986-03-04 |
| 4561289 | Perforated end plug plate for testing core samples | — | 1985-12-31 |
| 4390842 | Fluid conductivity device for measuring fluid volumes and method therefor | N. Duane Wygant | 1983-06-28 |
| 4206809 | Slug design in micellar-polymer flooding | — | 1980-06-10 |