Issued Patents All Time
Showing 76–91 of 91 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 | Theodore E. Zaleski, Jr., Scott Ray Schmidt, 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 | Theodore E. Zaleski, Jr., Scott Ray Schmidt, 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 | Theodore E. Zaleski, Jr., Scott Ray Schmidt, 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 | Theodore E. Zaleski, Jr., Scott Ray Schmidt, 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 | Theodore E. Zaleski, Jr., Scott Ray Schmidt, 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 | Theodore E. Zaleski, Jr., Scott Ray Schmidt, 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 | Theodore E. Zaleski, Jr., Scott Ray Schmidt, Don Q. Nguyen, Glenn R. Zadrapa, Chih Lin | 2001-05-15 |
| 6142249 | Earth-boring bit with improved bearing seal | Anton F. Zahradnik, Chih Lin, Terry J. Koltermann, Scott Ray Schmidt | 2000-11-07 |
| 6026917 | Earth-boring bit with improved bearing seal | Anton F. Zahradnik, Chih Lin, Terry J. Koltermann, Scott Ray Schmidt | 2000-02-22 |
| 5038640 | Titanium carbide modified hardfacing for use on bearing surfaces of earth boring bits | Louis H. Barnard | 1991-08-13 |
| 4899838 | Earth boring bit with convergent cutter bearing | Bruce H. Burr | 1990-02-13 |
| 4866245 | Method for manufacturing a rotary rock bit with improved weld root geometry | — | 1989-09-12 |
| 4741471 | Method for manufacturing a rotary rock bit | — | 1988-05-03 |
| 4726432 | Differentially hardfaced rock bit | Danny E. Scott | 1988-02-23 |
| 4567343 | Welding torch with dual gas shielding | Daniel Allford | 1986-01-28 |
| 4228339 | Method of hardfacing tool joints | Stanley R. Scales | 1980-10-14 |