Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4993403 | Method and apparatus for trapping heat energy | Charles W. Downs, Elaine I. Downs | 1991-02-19 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4993403 | Method and apparatus for trapping heat energy | Charles W. Downs, Elaine I. Downs | 1991-02-19 |