| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 11 | |
| #2 | Canada | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Machines | |
| #3 | Machine tools | |
| #4 | Measurement | |
| #5 | Mechanical elements | |
| #6 | Consumer goods |
| # | Name | Total Patents |
|---|---|---|
| #1 | Howard John H | 12 |
| #2 | Marsh Hallan N | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2329904A | Apparatus for welding | |
| US2190360A | Apparatus for making toothed cutters and the like | |
| US2109903A | Valve for core drills | |
| US2111781A | Well drilling bit | |
| US2138006A | Rotary core drill | |
| US2063437A | Core recovering means | |
| US2089481A | Method for facing tools | |
| US2054255A | Well drilling tool | |
| US1739675A | Pump dynamometer | |
| US1376145A | Safety tug-hook | |
| CA191533A | Hook for harness | |
| US1251528A | Tug-hook for harness. |