Issued Patents 1989
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4881579 | Liquid overfill tank assembly | — | 1989-11-21 |
| 4875361 | Double walled storage tanks with common rib supports | — | 1989-10-24 |
| 4870856 | Split fittings useful in forming a secondary semi-rigid pipeline over primary pipelines | — | 1989-10-03 |
| 4871078 | Storage tanks with formed jacket for secondary containment | — | 1989-10-03 |
| 4869386 | Double walled storage tank having a ribbed appearance | — | 1989-09-26 |
| 4859262 | Method of making storage tanks with secondary containment | — | 1989-08-22 |
| 4825687 | Storage tanks having formed inner tank for primary containment | — | 1989-05-02 |
| 4819821 | Cylindrical-shaped storage tanks with formed outer jacket | — | 1989-04-11 |
| 4807675 | Overfill assembly with removable lid | — | 1989-02-28 |