Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4885500 | Quartz quadrupole for mass filter | Stuart C. Hansen, John Fjeldsted | 1989-12-05 |
| 4804839 | Heating system for GC/MS instruments | John Fjeldsted | 1989-02-14 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4885500 | Quartz quadrupole for mass filter | Stuart C. Hansen, John Fjeldsted | 1989-12-05 |
| 4804839 | Heating system for GC/MS instruments | John Fjeldsted | 1989-02-14 |