| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 8 | |
| #2 | Canada | 7 | |
| #3 | Germany | 1 | |
| #4 | France | 1 | |
| #5 | United Kingdom | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Thermal processes | |
| #3 | Foods and drinks | |
| #4 | Machines |
| # | Technology | |
|---|---|---|
| #1 | General building constructions | |
| #2 | Structural elements | |
| #3 | Roof coverings | |
| #4 | Air-conditioning | |
| #5 | Food preservation | |
| #6 | Domestic plumbing installations | |
| #7 | Scaffolding | |
| #8 | Shaping clay |
| # | Name | Total Patents |
|---|---|---|
| #1 | Campbell Henry F | 7 |
| #2 | Campbell Henry Fred | 5 |
| #3 | Maior David G | 2 |
| #4 | Fred Campbell Henry | 1 |
| #5 | Campbell H | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US4295312A | Building construction | |
| US4080881A | Building construction | |
| CA1071919A | Food processing system | |
| US3987714A | Building construction | |
| CA1035920A | Building construction | |
| CA1020325A | Industrial building construction | |
| US3983259A | Food processing system | |
| US3842560A | Industrial building construction | |
| CA970585A | Prestressed concrete structures | |
| CA949767A | Concrete block wall panel | |
| US3676968A | Stressed concrete structures and method of making | |
| US3601937A | Multiple story building construction | |
| US3468094A | Building erection system | |
| CA901827A | Building system |