Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4955091 | Method and apparatus for a vacuum assisted toilet system | Lawrence M. Grills | 1990-09-11 |
| RE32750 | Fluid operated waste tank servicing assembly | Laurence M. Grills | 1988-09-20 |
| 4584726 | Fluid operated waste tank servicing assembly | Laurence M. Grills | 1986-04-29 |
| 4475290 | Flexible tank gauge | — | 1984-10-09 |