Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4823893 | Metal insert mounting | — | 1989-04-25 |
| 4551050 | Threaded engagement means | Robert W. Hughes | 1985-11-05 |
| 4505343 | Plural-part earth bit, and an improved bit head therefor | Robert W. Hughes | 1985-03-19 |
| 4413689 | Plural-part earth bit, and an improved bit head therefor | Robert W. Hughes | 1983-11-08 |
| 4314778 | Friction rock stabilizer and method for inserting thereof in an earth structure bore | — | 1982-02-09 |
| 4260294 | Friction rock stabilizer and method for inserting thereof in an earth structure bore | — | 1981-04-07 |