Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10047868 | Adjustable curtain style port valve device | — | 2018-08-14 |
| 9938713 | Mechanically secured block building system having a pipe opening therethrough | — | 2018-04-10 |
| 9328501 | Use devices for mechanically secured block assembly systems | J Kevin Harris, John D Ritchison, Roger F. Marsh | 2016-05-03 |
| 8893447 | Use devices for mechanically secured block assembly systems | J Kevin Harris, John D Ritchison | 2014-11-25 |