Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4865011 | Solid fuel burning space heating appliances | John N. Stancliffe, Stephen Carnelly, Robert W. Ferguson | 1989-09-12 |
| 4856491 | High efficiency solid fuel burning stove | Robert W. Ferguson | 1989-08-15 |