Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5735635 | Gravity feed watering system for plants | David B. R. Johnston, Marjorie R. Johnston | 1998-04-07 |
| 5605008 | Plant shelter | David B. R. Johnston, Marjorie R. Johnston | 1997-02-25 |
| 5398443 | Windowed shelter for plants | Marjorie R. Johnston, David B. R. Johnston | 1995-03-21 |
| 4202145 | Cast-in-place concrete slab pouring form | Alton R. Coulter, Lonnie G. Hubbard, Michael H. Rich | 1980-05-13 |