Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4885142 | Apparatus in the form of a disk for the separation of oxygen from other gases and/or for the pumping of oxygen and the method of removing the oxygen | C. Martin Berdahl, Wilbur J. Marner | 1989-12-05 |
| 4860669 | Energy efficient continuous flow ash lockhoper | Earl R. Collins, Jr., David Dubis | 1989-08-29 |