Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4636182 | Filter manufacturing method for the production of pre-filters to remove harmful substances in cigarette smoke by use of pine needles | Chu Hwan Cho | 1987-01-13 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4636182 | Filter manufacturing method for the production of pre-filters to remove harmful substances in cigarette smoke by use of pine needles | Chu Hwan Cho | 1987-01-13 |