Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6249119 | Rotating electromagnetic field defect detection system for tubular goods | Roy C. Grubbs | 2001-06-19 |
| 5867275 | Method and apparatus for high speed measurement of oilfield tubular diameter and ovality | Roy C. Grubbs, Kevin D. Logan, John A. Miller | 1999-02-02 |
| 5656786 | Oilfield tubular inspection method and apparatus | Kevin D. Logan, Michael K. Schoonover | 1997-08-12 |
| 5534775 | Method and apparatus for noncontact magnetic particle stray magnetic flux testing of cylindrical members | Clive Lam, Roy C. Grubbs | 1996-07-09 |