Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4676535 | Security seal | — | 1987-06-30 |
| 4539727 | Top-mounted double-action door hinge | Gerard Crennan, Arnold N. Anderson | 1985-09-10 |
| 4424995 | Ball type seal | Richard S. Guiler, Sigurd M. Moberg | 1984-01-10 |