| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 8 | |
| #2 | Canada | 4 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Electrical machinery and energy | |
| #3 | Control | |
| #4 | Machines | |
| #5 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Wing fittings | |
| #2 | Indexing scheme relating to hinges | |
| #3 | Gearing | |
| #4 | Electric switches | |
| #5 | Unspecified technologies | |
| #6 | Coin-freed | |
| #7 | Registering devices | |
| #8 | Platform constructions |
| # | Name | Total Patents |
|---|---|---|
| #1 | Gatland Geoffrey H | 7 |
| #2 | Robitaille Kenneth L | 7 |
| #3 | Miller Harold L | 4 |
| #4 | Miller H | 1 |
| Publication | Filing date | Title |
|---|---|---|
| CA1053272A | Door operator with instant reverse feature | |
| US4055023A | Door operator with instant reverse feature | |
| CA1021044A | Garage door power operator having partial open capability | |
| US3858452A | Emergency release for screw drive operator traveler assembly | |
| US3791072A | Gate arm clamp and serrating lever | |
| US3264785A | Safety door actuator | |
| US3193274A | Safety door actuator | |
| US3116380A | Card key system | |
| US2951920A | Rotary limit switch |