Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4869621 | Method of sealing permeable earth surface or subsurface materials having alkaline conditions by induced precipitation of carbonates | Eugene H. McLaren, George W. Putman | 1989-09-26 |
| 4805222 | Method and apparatus for verifying an individual's identity | Robert W. Hammon | 1989-02-14 |