Inventor
Richard A. Rosthal
Inventor
Houston, TX, US
Overview
Patents· 39 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
G01Vprimary
G01VGeophysics74%
E21BEarth or rock drilling10%
H01QAntennas, i.e. radio aerials6%
G01BMeasuring length, thickness or similar linear dimensions4%
G01NInvestigating or analysing materials by determining their chemical or physical properties4%
G06FElectric digital data processing2%
PatentTitleYear
9,476,857'Method and apparatus for removal of the double indication of defects in remote eddy current inspection of pipes'20169,069,097'Surface to borehole electromagnetic surveying using metallic well casings as electrodes'20159,035,657'Electromagnetic logging between a cased borehole and surface'20158,958,989'Method and apparatus for removal of the double indication of defects in remote eddy current inspection of pipes'20158,704,523'Measuring casing attenuation coefficient for electro-magnetics measurements'20148,638,103'Electromagnetic logging between borehole and surface'20148,614,578'Attenuation of electromagnetic signals passing through conductive material'20138,362,780'Induction coil impedance modeling using equivalent circuit parameters'20138,332,191'Correction factors for electromagnetic measurements made through conductive material'20128,326,539'Characterizing at least one property of a liner that lines a well'20128,310,239'Detecting electrical current in a magnetic structure'20127,795,872'Determining correction factors representing effects of different portions of a lining structure'20107,619,540'Apparatus and methods for determining isotropic and anisotropic formation resistivity in the presence of invasion'20097,536,261'Anti-symmetrized electromagnetic measurements'20097,414,391'Electromagnetic logging tool calibration system'20087,212,173'Flex (or printed) circuit axial coils for a downhole logging tool'20077,091,877'Apparatus and methods for determining isotropic and anisotropic formation resistivity in the presence of invasion'20066,969,994'Directional electromagnetic measurements insensitive to dip and anisotropy'20056,937,021'Method and apparatus for determining the presence and orientation of a fraction in an earth formation'20056,933,726'Apparatus and methods for reducing borehole current effects'20056,710,601'Borehole current correction for tilted or transverse magnetic dipoles on conductive supports'20046,693,430'Passive, active and semi-active cancellation of borehole effects for well logging'20046,690,170'Antenna structures for electromagnetic well logging tools'20046,680,613'Method and apparatus for cancellation of borehole effects due to a tilted or transverse magnetic dipole'20046,630,830'Shielding method and apparatus using flexible strip'20036,624,634'Borehole current correction methods and apparatus'20036,573,722'Method and apparatus for cancellation of borehole effects due to a tilted or transverse magnetic dipole'20036,566,881'Shielding method and apparatus using transverse slots'20036,557,794'Coil shielding method for selective attenuation of an electromagnetic energy field component'20036,380,744'Shielding apparatus for selective attenuation of an electromagnetic energy field component'20026,373,254'Method and apparatus for controlling the effect of contact impedance on a galvanic tool in a logging-while-drilling application'20026,351,127'Shielding method and apparatus for selective attenuation of an electromagnetic energy field component'20026,304,086'Method and apparatus for evaluating the resistivity of formations with high dip angles or high-contrast thin layers'20016,297,639'Method and apparatus for directional well logging with a shield having sloped slots'20015,463,320'Apparatus and method for determining the resitivity of underground formations surrounding a borehole'19955,339,037'Apparatus and method for determining the resistivity of earth formations'19945,329,448'Method and apparatus for determining horizontal conductivity and vertical conductivity of earth formations'19945,200,705'Dipmeter apparatus and method using transducer array having longitudinally spaced transducers'19935,157,605'Induction logging method and apparatus including means for combining on-phase and quadrature components of signals received at varying frequencies and including use of multiple receiver means associated with a single transmitter'1992Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1992–2016Patents assigned to SCHLUMBERGER TECHNOLOGY CORP (39)· patent assignee history
1992–2009Based in Houston, TX, US· patent location history
2002Based in Huston, TX, US· patent location history
2010–2016Based in Richmond, CA, US· patent location history
2012–2015Patents assigned to ROSTHAL RICHARD A (8)· patent assignee history
2012–2015Patents assigned to ZHANG HONG (8)· patent assignee history
2012–2014Patents assigned to ALUMBAUGH DAVID (3)· patent assignee history
2012–2014Patents assigned to LEVESQUE CYRILLE (3)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| SCHLUMBERGER TECHNOLOGY CORP | 39 | 1992–2016 |
| ROSTHAL RICHARD Aself | 8 | 2012–2015 |
| ZHANG HONG | 8 | 2012–2015 |
| ALUMBAUGH DAVID | 3 | 2012–2014 |
| LEVESQUE CYRILLE | 3 | 2012–2014 |
Locations
| Location | Patents | Span |
|---|---|---|
| Houston, Texas, US | 26 | 1992–2009 |
| Richmond, California, US | 12 | 2010–2016 |
| Huston, Texas, US | 1 | 2002 |