Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5301761 | Pressure reversing valve for a fluid-actuated, percussive drilling apparatus | Warren T. Lay | 1994-04-12 |
| 5085284 | Hybrid pneumatic percussion rock drill | — | 1992-02-04 |
| 4312604 | Friction rock stabilizer set, and a method of fixing a friction rock stabilizer in an earth structure bore | Satya Prakash Arya | 1982-01-26 |