| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 13 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Machine tools | |
| #3 | Packaging and shipping | |
| #4 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Platform constructions | |
| #2 | Hydraulic engineering | |
| #3 | Punching metal | |
| #4 | Lubricating | |
| #5 | Handling thin material | |
| #6 | Making metal sheets | |
| #7 | Earth drilling | |
| #8 | Dredging |
| # | Name | Total Patents |
|---|---|---|
| #1 | Schmidt Otto W | 13 |
| #2 | Carswell Firman L | 13 |
| Publication | Filing date | Title |
|---|---|---|
| US2474887A | Machine for making arch-type culverts by means of internally positioned forms | |
| US2483001A | Method of making arch-type conduits | |
| US2259335A | Subdrain pipe | |
| US2186364A | Method of and means for installing subdrain pipe | |
| US2153790A | Drainage tube | |
| US2153789A | Irrigation and drainage tube | |
| US2126870A | Culvert | |
| US1999500A | Trussed culvert | |
| US1964313A | Culvert | |
| US2010293A | Culvert structure | |
| US2021955A | Hot fluid gun | |
| US1955407A | Culvert | |
| US1922880A | Road grader |