Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4966764 | Process for producing low aluminum membrane cell feedbrine | David A. Helmstetter | 1990-10-30 |
| 4830837 | Process for removing aluminum from concentrated alkali metal halide brines | David D. Justice, David A. Helmstetter, Tsujihiko Fukunaga | 1989-05-16 |
| 4747917 | Scale-free process for purifying concentrated alkali metal halide brines containing sulfate ions as an impurity | Don E. Reynolds, Paul Breaux | 1988-05-31 |