Inventor
Darwin V. Ellis
Inventor
Ridgefield, CT, US
Overview
Patents· 15 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
G01Vprimary
G01VGeophysics88%
E21BEarth or rock drilling6%
G06FElectric digital data processing6%
PatentTitleYear
10,422,920Formation characterization for fast forward neutron models20198,521,435'Estimating sigma log beyond the measurements points'20138,063,356'Method of extracting formation density and Pe using a pulsed accelerator based litho-density tool'20117,902,496'Method of determining petro-physical information with high energy gamma rays'20117,292,942'Measuring formation density through casing'20077,279,677'Measuring wellbore diameter with an LWD instrument using compton and photoelectric effects'20077,112,783'Neutron measurement method for determining porosity of a formation surrounding a borehole'20066,552,334'Wellbore caliper measurement method using measurements from a gamma-gamma density'20035,390,115'Compensated gamma-gamma density sonde using three detectors'19954,816,674'Determining a formation porosity from neutron logging information'19894,810,876'Logging apparatus and method for determining absolute elemental concentrations of subsurface formations'19894,645,927'Clay type and volume evaluation'19874,542,292'Correction of natural gamma radiation logs for the effects of gamma ray emission from and attenuation by the borehole fluid'19854,423,323'Neutron logging method and apparatus for determining a formation characteristic free of environmental effects'19834,048,495'Doubly-compensated dual-detector density logging apparatus'1977Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1977–2019Patents assigned to SCHLUMBERGER TECHNOLOGY CORP (15)· patent assignee history
1977Based in Paris, FR· patent location history
1983–2019Based in Ridgefield, CT, US· patent location history
2011–2019Patents assigned to ELLIS DARWIN V (2)· patent assignee history
2011Patents assigned to CASE CHARLES R (1)· patent assignee history
2011Patents assigned to CHEN FELIX (1)· patent assignee history
2019Patents assigned to CASE CHARLES (1)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| SCHLUMBERGER TECHNOLOGY CORP | 15 | 1977–2019 |
| ELLIS DARWIN Vself | 2 | 2011–2019 |
| CASE CHARLES | 1 | 2019 |
| CASE CHARLES R | 1 | 2011 |
| CHEN FELIX | 1 | 2011 |
Locations
| Location | Patents | Span |
|---|---|---|
| Ridgefield, CT, US | 14 | 1983–2019 |
| Paris, FR | 1 | 1977 |