Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4540487 | Filter apparatus | John K. Johnson, Gordon L. Astrom, Mark A. Herbig | 1985-09-10 |
| 4422771 | Downflow mixer | Freddie J. Langdon, John K. Johnson | 1983-12-27 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4540487 | Filter apparatus | John K. Johnson, Gordon L. Astrom, Mark A. Herbig | 1985-09-10 |
| 4422771 | Downflow mixer | Freddie J. Langdon, John K. Johnson | 1983-12-27 |