Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5916544 | Sunscreen concentrate | Kou-Chang Liu, Michael W. Helioff, Mark Rerek, Lawrence J. Grenner, David E. Graham +2 more | 1999-06-29 |
| 5605685 | Non-irritating skin and hair rejuvenating compostion having a pH between 1 and 6.5 | Susan Y. Tseng, Michael W. Helioff, Jui-Chang Chuang, H. Karl Krummel | 1997-02-25 |