| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Canada | 4 | |
| #2 | United Kingdom | 3 | |
| #3 | United States | 3 | |
| #4 | Brazil | 1 | |
| #5 | France | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Construction of roads | |
| #2 | Unspecified technologies |
| # | Name | Total Patents |
|---|---|---|
| #1 | Birtchet Ralph D | 5 |
| #2 | Birtchet R | 2 |
| #3 | Carlson J | 2 |
| #4 | Carlson James O | 1 |
| #5 | Birtchet R D | 1 |
| Publication | Filing date | Title |
|---|---|---|
| CA1011978A | Roadway sloping attachment for asphalt paving machine | |
| GB1382163A | Roadway sloping attachment for asphalt paving machine | |
| CA990565A | Roadway sloping attachment for asphalt paving machine | |
| US3712189A | Screed extension assembly for asphalt paving machine | |
| US3680451A | Roadway sloping attachment for asphalt paving machine | |
| US3673930A | Screed extension assembly for asphalt paving machines |