Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4335193 | Microporous film, particularly battery separator, and method of making | Yoshinao Doi, Takeo Hanamura, Osamu Fujii, Katsumi Yoshitake, Tetsuhiko Hirata +1 more | 1982-06-15 |
| 4331622 | Method for manufacturing a microporous film having low electrical resistance and high durability | Yoshinao Doi, Osamu Fujii, Takeo Hanamura | 1982-05-25 |
| 4210709 | Microporous film battery separator | Yoshinao Doi, Osamu Fugii, Takeo Hanamura | 1980-07-01 |