Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5640948 | Safety device for use with portable heater | Tomio Nitta, Masato Seki, Yosimitu Kaga, Noriyuki Serizawa | 1997-06-24 |
| 5598833 | Safety device for use with portable heater | Tomio Nitta, Masato Seki, Yosimitu Kaga, Noriyuki Serizawa | 1997-02-04 |