Issued Patents All Time
Showing 1–25 of 32 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9963940 | Rotary drill bits comprising maraging steel and methods of forming such drill bits | Xiaomin Cheng, Eric C. Sullivan | 2018-05-08 |
| 9920614 | Apparatus and method for drilling wellbores based on mechanical specific energy determined from bit-based weight and torque sensors | Eric C. Sullivan, Lane E. Snell | 2018-03-20 |
| 9739093 | Cutting elements comprising sensors, earth-boring tools having such sensors, and associated methods | Eric C. Sullivan, Xiaomin Cheng | 2017-08-22 |
| 9328561 | Drill bits with sensors for formation evaluation | Eric C. Sullivan, Xiaomin Cheng, Gregory Prevost, Feyzi Inanc, Yi Liu +1 more | 2016-05-03 |
| 9145741 | Cutting elements comprising sensors, earth-boring tools having such sensors, and associated methods | Eric C. Sullivan, Xiaomin Cheng | 2015-09-29 |
| 9004161 | Apparatus and methods for real time communication in drill strings | Eric C. Sullivan | 2015-04-14 |
| 8991471 | Methods of forming earth-boring tools | Xiaomin Cheng, Eric C. Sullivan | 2015-03-31 |
| 8967295 | Drill bit-mounted data acquisition systems and associated data transfer apparatus and method | Jason R. Habernal, R. Keith Glasgow, Jr., Eric C. Sullivan | 2015-03-03 |
| 8893822 | Apparatus and methods for real time communication between drill bit and drilling assembly | Eric C. Sullivan | 2014-11-25 |
| 8887832 | Apparatus and methods for corrosion protection of downhole tools | Eric C. Sullivan | 2014-11-18 |
| 8777088 | Methods for attaching cutting elements to earth-boring tools using tapered surfaces | Eric C. Sullivan, Xiaomin Cheng | 2014-07-15 |
| 8695728 | Formation evaluation using a bit-based active radiation source and a gamma ray detector | Eric C. Sullivan, David A. Curry, Xiaomin Cheng, Feyzi Inanc, Yi Liu | 2014-04-15 |
| 8573326 | Method and apparatus to adjust weight-on-bit/torque-on-bit sensor bias | Eric C. Sullivan | 2013-11-05 |
| 8573327 | Apparatus and methods for estimating tool inclination using bit-based gamma ray sensors | Eric C. Sullivan, Xiaomin Cheng | 2013-11-05 |
| 8481920 | Apparatus and method for determining formation density from nuclear density measurements made using sensors at more than one location | Feyzi Inanc, W. Allen Gilchrist, Eric C. Sullivan, Yi Liu | 2013-07-09 |
| 8245792 | Drill bit with weight and torque sensors and method of making a drill bit | Eric C. Sullivan, Daryl L. Pritchard | 2012-08-21 |
| 8245793 | Apparatus and method for determining corrected weight-on-bit | Eric C. Sullivan | 2012-08-21 |
| 8240403 | Earth-boring tools with improved retention of cutting elements installed within pockets | Eric C. Sullivan | 2012-08-14 |
| 8215384 | Bit based formation evaluation and drill bit and drill string analysis using an acoustic sensor | Eric C. Sullivan | 2012-07-10 |
| 8210280 | Bit based formation evaluation using a gamma ray sensor | Eric C. Sullivan, David A. Curry | 2012-07-03 |
| 8162077 | Drill bit with weight and torque sensors | Keith Glasgow, Sorin Gabriel Teodorescu, Eric C. Sullivan, Daryl L. Pritchard, Xiaomin Cheng | 2012-04-24 |
| 8100196 | Method and apparatus for collecting drill bit performance data | Paul E. Pastusek, Eric C. Sullivan, Daryl L. Pritchard, Keith Glasgow, Paul J. Lutes | 2012-01-24 |
| 8087477 | Methods and apparatuses for measuring drill bit conditions | Eric C. Sullivan | 2012-01-03 |
| 7987925 | Method and apparatus for collecting drill bit performance data | Paul E. Pastusek, Eric C. Sullivan, Daryl L. Pritchard, R. Keith Glasgow, Jr., Paul J. Lutes | 2011-08-02 |
| 7946357 | Drill bit with a sensor for estimating rate of penetration and apparatus for using same | Eric C. Sullivan, Daryl L. Pritchard | 2011-05-24 |