Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4854074 | Injection capsule for treating trees | Robert E. Johnson | 1989-08-08 |
| 4848028 | Injection tool for treating trees | Robert E. Johnson, Christopher I. Hunt | 1989-07-18 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4854074 | Injection capsule for treating trees | Robert E. Johnson | 1989-08-08 |
| 4848028 | Injection tool for treating trees | Robert E. Johnson, Christopher I. Hunt | 1989-07-18 |