Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5301910 | "Collapsible slanted ""X""-shaped support structure" | Donald Lang | 1994-04-12 |
| 4728066 | Collapsible triangulated tension support structure | Donald Lang | 1988-03-01 |
| 4632344 | Adjustable and collapsible triangulated tension support structure | Donald Lang | 1986-12-30 |