Issued Patents All Time
Showing 1–11 of 11 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7066280 | Method and apparatus for monitoring and recording of the operating condition of a downhole drill bit during drilling operations | Eric C. Sullivan, Theodore E. Zaleski, Jr., Don Q. Nguyen, Glenn R. Zadrapa, Timothy K. Marvel +1 more | 2006-06-27 |
| 6626251 | Method and apparatus for monitoring and recording of the operating condition of a downhole drill bit during drilling operations | Eric C. Sullivan, Theodore E. Zaleski, Jr., Don Q. Nguyen, Glenn R. Zadrapa, Chih Lin | 2003-09-30 |
| 6571886 | Method and apparatus for monitoring and recording of the operating condition of a downhole drill bit during drilling operations | Eric C. Sullivan, Theodore E. Zaleski, Jr., Don Q. Nguyen, Glenn R. Zadrapa, Timothy K. Marvel +1 more | 2003-06-03 |
| 6543312 | Method and apparatus for monitoring and recording of the operating condition of a downhole drill bit during drilling operations | Eric C. Sullivan, Theodore E. Zaleski, Jr., Don Q. Nguyen, Glenn R. Zadrapa, Chih Lin | 2003-04-08 |
| 6540033 | Method and apparatus for monitoring and recording of the operating condition of a downhole drill bit during drilling operations | Eric C. Sullivan, Theodore E. Zaleski, Jr., Don Q. Nguyen, Glenn R. Zadrapa, Chih Lin | 2003-04-01 |
| 6419032 | Method and apparatus for monitoring and recording of the operating condition of a downhole drill bit during drilling operations | Eric C. Sullivan, Theodore E. Zaleski, Jr., Don Q. Nguyen, Glenn R. Zadrapa, Chih Lin | 2002-07-16 |
| 6230822 | Method and apparatus for monitoring and recording of the operating condition of a downhole drill bit during drilling operations | Eric C. Sullivan, Theodore E. Zaleski, Jr., Don Q. Nguyen, Glenn R. Zadrapa, Chih Lin | 2001-05-15 |
| 6209668 | Earth-boring bit with improved cutting structure | Rudolf Carl Pessier, Don Q. Nguyen | 2001-04-03 |
| 6142249 | Earth-boring bit with improved bearing seal | Anton F. Zahradnik, Eric C. Sullivan, Chih Lin, Terry J. Koltermann | 2000-11-07 |
| 6026917 | Earth-boring bit with improved bearing seal | Anton F. Zahradnik, Eric C. Sullivan, Chih Lin, Terry J. Koltermann | 2000-02-22 |
| 5813480 | Method and apparatus for monitoring and recording of operating conditions of a downhole drill bit during drilling operations | Theodore E. Zaleski, Jr. | 1998-09-29 |