Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4859375 | Chemical refill system | John C. Schumacher, Richard E. Howard, Peter T. Randtke, Adrian Sandu, Robert E. Fletcher +1 more | 1989-08-22 |
| 4855023 | Method and apparatus for the continuous on-site chemical reprocessing of ultrapure liquids used in semiconductor wafer cleaning | R. Scot Clark, Joe G. Hoffman, John B. Davison, Alan W. Jones, Allen H. Jones, Jr. +2 more | 1989-08-08 |
| 4828660 | Method and apparatus for the continuous on-site chemical reprocessing of ultrapure liquids | R. Scot Clark, Joe G. Hoffman, John B. Davison, Alan W. Jones, Allen H. Jones, Jr. +2 more | 1989-05-09 |