| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Canada | 12 | |
| #2 | United States | 3 |
| # | Industry | |
|---|---|---|
| #1 | Machines | |
| #2 | Mechanical elements | |
| #3 | Civil engineering |
| # | Technology | |
|---|---|---|
| #1 | Dredging | |
| #2 | Unspecified technologies | |
| #3 | Venting or aerating devices | |
| #4 | Pipes | |
| #5 | Unspecified technologies |
| # | Name | Total Patents |
|---|---|---|
| #1 | Parker Calvin S | 15 |
| Publication | Filing date | Title |
|---|---|---|
| US1470028A | Ditching apparatus | |
| CA177836A | Cementitious article | |
| CA177837A | Method of forming cenentitious articles | |
| US1054863A | Gasket. | |
| CA123769A | Steam trap | |
| US1015243A | Trap. | |
| CA298589A | Method of treating soils | |
| CA308481A | Ditching machine | |
| CA295300A | Ditching machine | |
| CA304516A | Ditching machine | |
| CA292704A | Tile joint covering apparatus | |
| CA295299A | Apparatus for filling trenches, and grading the shoulders of paved roadways | |
| CA305365A | Ditching machine | |
| CA413623A | Wire reclaiming apparatus | |
| CA304517A | Ditching machine |