Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4252244 | Layered pressure vessel head with machined surfaces | Ralph R. Christian | 1981-02-24 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4252244 | Layered pressure vessel head with machined surfaces | Ralph R. Christian | 1981-02-24 |