Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4690073 | Locking mechanism | — | 1987-09-01 |
| 4615280 | High security support and enclosure structure for electronic equipment | Harry T. Graef, Kevin H. Newton, Spencer M. Grucza | 1986-10-07 |
| 4593627 | Burglary attack resistant money safe high fiber concrete reinforced metal encased wall and door construction and manufacture | David R. Lankard | 1986-06-10 |
| 4559881 | Burglary resistant steel fiber reinforced concrete construction for vault walls and doors and manufacture thereof | David R. Lankard | 1985-12-24 |