Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5178485 | Heat exchanging pipe system for uniformly heating road surfaces and the like | Takayuki Hiyama | 1993-01-12 |
| 5062736 | Snow melting method utilizing heat retaining function of underground aquifer without sprinkling water | Takayuki Hiyama | 1991-11-05 |
| 5024553 | Non-water-sprinkling type snow melting method and system | — | 1991-06-18 |