Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8517594 | Apparatus for manufacturing set cellular cement | Michel Rigaudon, Jorg Bold, Steven Roy Butler | 2013-08-27 |
| 8119207 | Process and apparatus for manufacturing set cellular cement | Michel Rigaudon, Jorg Bold, Steven Roy Butler | 2012-02-21 |
| 7332114 | Process for manufacturing sound absorbing cement tile | Steven Roy Butler, Jorg Bold, Michel Rigaudon | 2008-02-19 |