Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4673044 | Earth boring bit for soft to hard formations | Louis K. Bigelow, Richard H. Grappendorf | 1987-06-16 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4673044 | Earth boring bit for soft to hard formations | Louis K. Bigelow, Richard H. Grappendorf | 1987-06-16 |