Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4840615 | Self-sealing injection reservoir | William Dubrul, Charles J. Heyler, III | 1989-06-20 |
| 4798584 | Self-sealing injection reservoir | William Dubrul, Charles J. Heyler, III | 1989-01-17 |