Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6457517 | Composite landing collar for cementing operation | Sidney K. Smith, Jr., Paul Zutz, Yusheng Yuan | 2002-10-01 |
| 6305468 | Downhole screen and method of manufacture | John Todd Broome, Benn Voll, Gary Corbett, Yusheng Yuan, Elmer R. Peterson | 2001-10-23 |