Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10689302 | System, method and apparatus for entraining air in concrete | Charles D. Welker | 2020-06-23 |
| 10532954 | System, method and apparatus for entraining air in concrete | Charles D. Welker | 2020-01-14 |
| 9593050 | System, method and apparatus for entraining air in concrete | Charles D. Welker | 2017-03-14 |
| 8408781 | System, method and apparatus for entraining air in concrete | Charles D. Welker | 2013-04-02 |