| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 11 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Machine tools | |
| #3 | Transport | |
| #4 | Engines, pumps and turbines | |
| #5 | Agriculture |
| # | Technology | |
|---|---|---|
| #1 | Dredging | |
| #2 | Tools for connecting or disengaging | |
| #3 | Wheelchairs and sledges | |
| #4 | Harvesting | |
| #5 | Pumps |
| # | Name | Total Patents |
|---|---|---|
| #1 | Clark Marion A | 11 |
| Publication | Filing date | Title |
|---|---|---|
| US4215872A | Positive shift derailleur mechanism | |
| US3913945A | Bicycle with variable speed lever action drive | |
| US2931111A | Scraper | |
| US2528741A | Drag scraper | |
| US2511100A | Hayrake | |
| US2564563A | Rotary carry-type scraper | |
| US2524376A | Sliding side jaw wrench having toggle means for moving and locking the movable jaw relative to the fixed jaw | |
| US2404123A | Carrying scraper | |
| US2446212A | Pipe wrench having a fixed jaw and a cooperating reciprocating rotary jaw | |
| US1867906A | Double-action pump | |
| US1547205A | Scraper |