Issued Patents All Time
Showing 25 most recent of 31 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9057801 | Geophysical data acquisition system | John Jiang, Azizuddin Abdul Aziz, Ying Liu | 2015-06-16 |
| 8890532 | Method for determining an electric field response of the earth's subsurface | Stefan L. Helwig | 2014-11-18 |
| 8154295 | Method for determining electric field response to an electromagnetic field induced in the Earth's subsurface | Stefan L. Helwig | 2012-04-10 |
| 8026723 | Multi-component marine electromagnetic signal acquisition method | Joern Olaf Loehken, Stefan L. Helwig, Tilman Hanstein | 2011-09-27 |
| 7872477 | Multi-component marine electromagnetic signal acquisition cable and system | Stefan L. Helwig | 2011-01-18 |
| 7800374 | Multi-component marine electromagnetic signal acquisition cable and system | Stefan L. Helwig | 2010-09-21 |
| 7746077 | Method for measuring the magnetotelluric response to the earth's subsurface | Stefan L. Helwig | 2010-06-29 |
| 7705599 | Buoy-based marine electromagnetic signal acquisition system | Ian McMillan, Stefan L. Helwig | 2010-04-27 |
| 7574410 | Fast 3D inversion of electromagnetic survey data using a trained neural network in the forward modeling branch | — | 2009-08-11 |
| 7474101 | Method for combined transient and frequency domain electromagnetic measurements | — | 2009-01-06 |
| 7388382 | System for measuring Earth formation resistivity through an electrically conductive wellbore casing | Horst Rueter | 2008-06-17 |
| 7356411 | Method for acquiring and interpreting transient electromagnetic measurements | Charles Stoyer | 2008-04-08 |
| 7340348 | Method for acquiring and interpreting seismoelectric and electroseismic data | Norman C. Allegar | 2008-03-04 |
| 7328107 | Integrated earth formation evaluation method using controlled source electromagnetic survey data and seismic data | Horst Rueter, Leon Thomsen | 2008-02-05 |
| 7272503 | Method and apparatus for measuring formation conductivities from within cased wellbores by combined measurement of casing current leakage and electromagnetic response | Horst Rueter | 2007-09-18 |
| 7203599 | Method for acquiring transient electromagnetic survey data | Leon Thomsen, Horst Rueter | 2007-04-10 |
| 7202671 | Method and apparatus for measuring formation conductivities from within cased wellbores by combined measurement of casing current leakage and electromagnetic response | Horst Rueter | 2007-04-10 |
| 7034538 | Method for measuring earth formation resistivity through an electrically conductive wellbore casing | Horst Rueter | 2006-04-25 |
| 6975121 | System for measuring earth formation resistivity through and electrically conductive wellbore casing | Horst Rueter | 2005-12-13 |
| 6891376 | Method for attenuating conductive sonde mandrel effects in an electromagnetic induction well logging apparatus | Tilman Hanstein, Horst Rueter | 2005-05-10 |
| 6739165 | Combined surface and wellbore electromagnetic measurement system and method for determining formation fluid properties | — | 2004-05-25 |
| 6670813 | Integrated borehole system for reservoir detection and monitoring | — | 2003-12-30 |
| 6541975 | Integrated borehole system for reservoir detection and monitoring | — | 2003-04-01 |
| 6147496 | Determining electrical conductivity of a laminated earth formation using induction logging | Leonty A. Tabarovsky, David Ronald Bear, Melis van der Horst | 2000-11-14 |
| 5955884 | Method and apparatus for measuring transient electromagnetic and electrical energy components propagated in an earth formation | Christopher Charles Payton, Leonty A. Tabarovsky | 1999-09-21 |