Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4848407 | Pipeline rehabilitation method utilizing articulated gasketed-joint pipe | Harold Robert Smith, Jr. | 1989-07-18 |
| 4826423 | Construction of thermoplastic tubes with tubular ribs by helical winding upon a mandrel | James H. Miller, Leonard F. Sansone | 1989-05-02 |