Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4896454 | Apparatus and method for treating trees | Duane Cronenwett | 1990-01-30 |
| 4833824 | Apparatus and method for injection tree with antibiotics, nutriments or the like | Duane Cronenwett | 1989-05-30 |
| 4766659 | Method of making a cartridge for use in injecting a liquid into a tree | Duane Cronenwett | 1988-08-30 |
| 4698935 | Apparatus and method for injecting trees | Duane Cronenwett | 1987-10-13 |
| 4603529 | Roofing system | Duane Cronenwett | 1986-08-05 |