Issued Patents 2021
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11180995 | Water and/or fire resistant tunnel expansion joint systems | William Witherspoon | 2021-11-23 |
| 10934704 | Fire and/or water resistant expansion joint system | Bill Witherspoon | 2021-03-02 |