Issued Patents 2019
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10519651 | Fire resistant tunnel expansion joint systems | William Witherspoon | 2019-12-31 |
| 10422127 | Precompressed foam expansion joint system transition | Bill Witherspoon | 2019-09-24 |
| 10316661 | Water and/or fire resistant tunnel expansion joint systems | William Witherspoon | 2019-06-11 |
| 10179993 | Water and/or fire resistant expansion joint system | William Witherspoon | 2019-01-15 |