Inventor
MADHAVAN RAGHU
US30 patents
⚠️ This page may combine multiple inventors who share the name “MADHAVAN RAGHU”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
SCHLUMBERGER TECHNOLOGY CORP
13 patentsUS6866306B2Mar 15, 2005
Low-loss inductive couplers for use in wired pipe strings
SCHLUMBERGER TECHNOLOGY CORP208 citations99
US6641434B2Nov 4, 2003
Wired pipe joint with current-loop inductive couplers
SCHLUMBERGER TECHNOLOGY CORP289 citations99
US6315050B2Nov 13, 2001
Packer
SCHLUMBERGER TECHNOLOGY CORP116 citations98
US6218661B1Apr 17, 2001
Methods and apparatus for mechanically enhancing the sensitivity of transversely loaded fiber optic sensors
SCHLUMBERGER TECHNOLOGY CORP100 citations98
US7913773B2Mar 29, 2011
Bidirectional drill string telemetry for measuring and drilling control
SCHLUMBERGER TECHNOLOGY CORP85 citations97
US7040415B2May 9, 2006
Downhole telemetry system and method
SCHLUMBERGER TECHNOLOGY CORP81 citations97
US6304686B1Oct 16, 2001
Methods and apparatus for measuring differential pressure with fiber optic sensor systems
SCHLUMBERGER TECHNOLOGY CORP78 citations96
US6564876B2May 20, 2003
Packer
SCHLUMBERGER TECHNOLOGY CORP64 citations95
US6186227B1Feb 13, 2001
Packer
SCHLUMBERGER TECHNOLOGY CORP70 citations95
US6898339B2May 24, 2005
Multiple mode pre-loadable fiber optic pressure and temperature sensor
SCHLUMBERGER TECHNOLOGY CORP55 citations94
US6246048B1Jun 12, 2001
Methods and apparatus for mechanically enhancing the sensitivity of longitudinally loaded fiber optic sensors
SCHLUMBERGER TECHNOLOGY CORP65 citations94
US7413021B2Aug 19, 2008
Method and conduit for transmitting signals
SCHLUMBERGER TECHNOLOGY CORP49 citations92
US10233934B2Mar 19, 2019
Fracture-resistant self-lubricating wear surfaces
SCHLUMBERGER TECHNOLOGY CORP5 citations72
INTELLISERV LLC
5 patentsUS7817062B1Oct 19, 2010
Surface communication apparatus and method for use with drill string telemetry
INTELLISERV LLC123 citations95
US9121962B2Sep 1, 2015
Method and conduit for transmitting signals
INTELLISERV LLC11 citations84
US8344905B2Jan 1, 2013
Method and conduit for transmitting signals
INTELLISERV LLC8 citations84
US7857644B2Dec 28, 2010
Wired drill pipe having conductive end connections
INTELLISERV LLC10 citations84
US7683802B2Mar 23, 2010
Method and conduit for transmitting signals
INTELLISERV LLC11 citations82
MADHAVAN RAGHU
5 patentsUS9157313B2Oct 13, 2015
Systems and methods for detecting drillstring loads
MADHAVAN RAGHU9 citations83
US8120508B2Feb 21, 2012
Cable link for a wellbore telemetry system
MADHAVAN RAGHU12 citations82
US8810428B2Aug 19, 2014
Electrical transmission between rotating and non-rotating members
MADHAVAN RAGHU3 citations59
US8322196B2Dec 4, 2012
Vibrating wire viscometers
MADHAVAN RAGHU3 citations54
US8398301B2Mar 19, 2013
Apparatus for determining downhole fluid temperatures
MADHAVAN RAGHU1 citations47