Issued Patents All Time
Showing 26–43 of 43 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5794516 | Piston for a self-lubricating, fluid-actuated, percussive down-the-hole drill | Dale R. Wolfer | 1998-08-18 |
| 5735358 | Indexing percussive drilling bit | — | 1998-04-07 |
| 5711205 | Self-lubricating, fluid-actuated, percussive down-the-hole drill | Dale R. Wolfer | 1998-01-27 |
| 5682957 | Water separator for a down hole drill | — | 1997-11-04 |
| 5566771 | Reversible casing for a self-lubricating, fluid-actuated, percussive down-the-hole drill | Dale R. Wolfer | 1996-10-22 |
| 5562170 | Self-lubricating, fluid-actuated, percussive down-the-hole drill | Dale R. Wolfer | 1996-10-08 |
| 5390749 | Apparatus for positioning a split retaining ring in a down-hole percussive drill | — | 1995-02-21 |
| 5342520 | Filter for a rockdrill | — | 1994-08-30 |
| 5325926 | Reversible casing for a down-the-hole percussive apparatus | Warren T. Lay | 1994-07-05 |
| 5277098 | On-off valve for hydraulic rockdrill | Thomas J. Mlasgar | 1994-01-11 |
| 5240083 | Device for removing drillhole debris | — | 1993-08-31 |
| 5196118 | Percussion tool fluid filter apparatus | Richard L. Eggeling | 1993-03-23 |
| 5191946 | Wrap spring clutch for percussive apparatus | Robert R. Kimberlin | 1993-03-09 |
| 5143162 | Device for removing debris from a drillhole | Ernest C. Hinck | 1992-09-01 |
| 5139095 | Method for removing debris from a drillhole | Ernest C. Hinck | 1992-08-18 |
| 5139093 | Wrap spring clutch for percussive apparatus | Robert R. Kimberlin | 1992-08-18 |
| 5020610 | Removable filter fluid flow shutoff apparatus | Richard L. Eggeling | 1991-06-04 |
| 4846634 | Water to emulsion transformer | Godfrey G. Vos, Derek E. Newman | 1989-07-11 |