Issued Patents 2011
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7979938 | Changing amplitude of movement by changing the drive frequency of a toothbrush brushhead | Ronald C. Lilley, Scott E. Hall, William E. Bryant, Joseph W. Grez | 2011-07-19 |