Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5121579 | Portable sectional flooring system with post support | Douglas J. Hamar, Gopal Jayaraman, Richard Granroth, Harold A. Evenson, Edward K. Hamar | 1992-06-16 |
| 5020286 | Portable sectional flooring system with post support | Douglas J. Hamar, Gopal Jayaraman, Richard Granroth, Harold A. Evensen | 1991-06-04 |
| 4240341 | Can crusher | William F. Warren | 1980-12-23 |