Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4666346 | Rotatable fill pipe with collapsible backfill elbow and method of employing same to blind-fill underground voids | — | 1987-05-19 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4666346 | Rotatable fill pipe with collapsible backfill elbow and method of employing same to blind-fill underground voids | — | 1987-05-19 |