Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D327797 | Supporting display unit for an overhead | — | 1992-07-14 |
| 4588175 | Torsion spring apparatus and method | David O. Martin | 1986-05-13 |
| 4492067 | End stile apparatus and method for an overhead door section | David O. Martin | 1985-01-08 |
| RE31461 | Method of preparing a section for an overhead door | David O. Martin | 1983-12-13 |
| 4347653 | Method of preparing a section for an overhead door | David O. Martin | 1982-09-07 |
| 4284119 | Overhead door and overhead door section system and method | David O. Martin | 1981-08-18 |