Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9605485 | Percussion drilling assembly and hammer bit with gage and outer row reinforcement | Shantanu N. Swadi, Charles H. Dewey, Alan J. Marshall | 2017-03-28 |
| 8763729 | Percussion drilling assembly and hammer bit with gage and outer row reinforcement | Shantanu N. Swadi, Charles H. Dewey, Alan J. Marshall | 2014-07-01 |
| 8387725 | Percussion drilling assembly and hammer bit with gage and outer row reinforcement | Shantanu N. Swadi, Charles H. Dewey, Alan J. Marshall | 2013-03-05 |
| 5921332 | Apparatus for facilitating removal of a casing of an overburden drilling equipment from a bore | — | 1999-07-13 |
| 5839519 | Methods and apparatus for attaching a casing to a drill bit in overburden drilling equipment | — | 1998-11-24 |