Issued Patents All Time
Showing 26–29 of 29 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5987688 | Gum-massaging oral brush | T. Craig Masterman, Edward Park, Philip Sweeney, Mingchih M. Tseng, Stephen Charles Witkus | 1999-11-23 |
| 5904152 | Dental floss | Mingchih M. Tseng, Thomas Craig Masterman, Edward Park, Jean L. Spencer | 1999-05-18 |
| 5845652 | Dental floss | Mingchih M. Tseng, Thomas Craig Masterman, Edward Park, Jean L. Spencer | 1998-12-08 |
| 5755243 | Dental floss with thermoplastic coating | David Anglin, Brad Castillo, Casper W. Chiang, Jean L. Spencer | 1998-05-26 |