Issued Patents 2022
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11536374 | Cleanout conduit valve assemblies and installations | David Alan Putnam | 2022-12-27 |
| 11274783 | Sure-seal cleanout conduit valve assemblies and methods | David Alan Putnam | 2022-03-15 |