| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 6 | |
| #2 | Canada | 4 | |
| #3 | Australia | 1 | |
| #4 | Germany | 1 | |
| #5 | United Kingdom | 1 | |
| #6 | WIPO (World Intellectual Property Organization) | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Control |
| # | Name | Total Patents |
|---|---|---|
| #1 | Dickson J Douglas | 4 |
| #2 | Hemmerling Gene A | 4 |
| #3 | Burton Charles A | 4 |
| #4 | Boyd Douglas E | 4 |
| #5 | Rice David C | 1 |
| #6 | Holthouse Jeffery A | 1 |
| #7 | Sjobring Nils P | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US5712546A | Control system for door positioning assembly | |
| US5377448A | Door positioning system | |
| US4461120A | Pass door assembly | |
| US4467562A | Fire door assembly | |
| CA1176024A | Edge-to-edge panel connection | |
| US926361A | Sheet-metal door. |