Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8959976 | Apparatus for manufacturing a metal plate for a duct, including mesh-type beads | — | 2015-02-24 |
| 8915109 | Manufacturing apparatus and method of spiral duct including elbow | — | 2014-12-23 |
| 8522587 | Joint jig of spiral duct manufacturing apparatus | — | 2013-09-03 |
| 7730754 | Apparatus and method for manufacturing spiral duct | Seok Heo | 2010-06-08 |