Issued Patents All Time
Showing 1–16 of 16 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12291925 | Underreamer drill hammer | Austin C. Hine | 2025-05-06 |
| 8800690 | Down-the-hole drill hammer having a reverse exhaust system and segmented chuck assembly | Leland H. Lyon | 2014-08-12 |
| 8631884 | Pressure reversing valve assembly for a down-the-hole percussive drilling apparatus | Leland H. Lyon | 2014-01-21 |
| 8622152 | Down-the-hole drill hammer having a sliding exhaust check valve | Leland H. Lyon | 2014-01-07 |
| 8439135 | Down-the-hole drill hammer having an extendable drill bit assembly | Leland H. Lyon | 2013-05-14 |
| D656974 | Drill bit | Leland H. Lyon | 2012-04-03 |
| 8141663 | Down hole hammer having elevated exhaust | Leland H. Lyon | 2012-03-27 |
| 8011455 | Down hole hammer having elevated exhaust | Leland H. Lyon | 2011-09-06 |
| 7467675 | Device for channeling solids and fluids within a reverse circulation drill | — | 2008-12-23 |
| 6799641 | Percussive drill with adjustable flow control | Leland H. Lyon, Jeffrey White | 2004-10-05 |
| 6474910 | Rockbolt assembly | — | 2002-11-05 |
| 6237704 | Backhead and check valve for down-hole drills | — | 2001-05-29 |
| 6170581 | Backhead and check valve for down-hole drills | — | 2001-01-09 |
| 5325926 | Reversible casing for a down-the-hole percussive apparatus | Leland H. Lyon | 1994-07-05 |
| 5301761 | Pressure reversing valve for a fluid-actuated, percussive drilling apparatus | Chuen-Cheng Fu | 1994-04-12 |
| 5207283 | Reversible bit bearing | — | 1993-05-04 |