Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7490872 | Corner piece-less duct, method of producing the same, and duct-forming machine | Toshio Yamamoto, Mitsuru Marukawa, Yoshimasa Yoshimoto, Takashi Hara | 2009-02-17 |
| 6814106 | Duct joint structure | — | 2004-11-09 |
| 6463961 | Duct hanger and method for hanging duct using hanger | — | 2002-10-15 |
| 6056021 | Duct joint structure, assembly tool, duct assembly method and hanger | — | 2000-05-02 |
| 5996644 | Duct joint structure, assembly tool, duct assembly method and hanger | — | 1999-12-07 |