Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4889541 | Separation of gases | — | 1989-12-26 |
| 4808309 | Variable length membrane module | Richard P. Guptill, Martin D. Hilmar | 1989-02-28 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4889541 | Separation of gases | — | 1989-12-26 |
| 4808309 | Variable length membrane module | Richard P. Guptill, Martin D. Hilmar | 1989-02-28 |