Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4832765 | Duplex alloy | Terry A. DeBold, David Englehart | 1989-05-23 |
| 4796701 | Pyrolytic carbon coating of media improves gravel packing and fracturing capabilities | Tommy E. Hudson | 1989-01-10 |