| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Canada | 12 | |
| #2 | United States | 6 | |
| #3 | Austria | 1 | |
| #4 | United Kingdom | 1 |
| # | Industry | |
|---|---|---|
| #1 | Engines, pumps and turbines | |
| #2 | Agriculture | |
| #3 | Machines | |
| #4 | Civil engineering |
| # | Technology | |
|---|---|---|
| #1 | Rotary-pistons | |
| #2 | Animal care | |
| #3 | Water-closets with flushing devices | |
| #4 | Unspecified technologies |
| # | Name | Total Patents |
|---|---|---|
| #1 | Hoffman William M | 19 |
| #2 | Hoffman Bertram F | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2502846A | Line guide tip for fishing rods and the like | |
| US2502845A | Line guide element for fishing rods and the like | |
| US2160213A | Closet ventilator | |
| CA192802A | Oil burner | |
| CA174270A | Boring machine | |
| CA162257A | Resilient wheel | |
| CA156867A | Resilient wheel | |
| US1084635A | Rotary engine. | |
| CA126456A | Rotary engine | |
| CA113417A | Rotary engine | |
| CA96647A | Rotary engine | |
| US803693A | Rotary engine. | |
| GB190110980A | Improvements in Rotary Engines | |
| CA71517A | Rotary engine | |
| US675353A | Rotary engine. | |
| CA206638A | Hydro-carbon burner | |
| CA204687A | Fuel oil burner | |
| CA19918A | Machine for putting out the grain and removing the water or other imperfections from calf, sheep, goat and other skins | |
| CA21990A | Putting-out machine for tanning purposes |