Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9970237 | Steerable earth boring assembly | Ricki Don Marshall | 2018-05-15 |
| 9890592 | Drive shaft for steerable earth boring assembly | Ricki Don Marshall | 2018-02-13 |
| 9890593 | Steerable earth boring assembly having flow tube with static seal | Ricki Don Marshall | 2018-02-13 |
| 9580968 | Rotary steerable drilling tool with electromagnetic steering system | Ce Liu, Ricki Don Marshall, Jing Li | 2017-02-28 |
| 8570045 | Drilling system for making LWD measurements ahead of the bit | Borislav J. Tchakarov, Stephen D. Bonner, Ricki Don Marshall | 2013-10-29 |