David J. Schaefer
8Patents
5h-index
9Co-inventors
52Inventor score
Filing activity: Jul 31, 1996 → Apr 19, 2012
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US7841642B2 | Retractable tarping system | Performing Operations; Transporting | 18 | Active |
| US7967363B2 | Rail car cover system | Performing Operations; Transporting | 12 | Active |
| US7823515B2 | Rail car cover system | Performing Operations; Transporting | 9 | Active |
| US6098811A | Grizzly screening apparatus | Performing Operations; Transporting | 8 | Expired |
| US8826827B1 | Rail car cover system | Emerging Cross-Sectional Technologies | 5 | Active |
| US8141498B2 | Rail car extension system | Performing Operations; Transporting | 3 | Active |
| US6336560B1 | Grizzly screening apparatus | Performing Operations; Transporting | 2 | Expired |
| US8869711B1 | Control system for rail car cover system | Emerging Cross-Sectional Technologies | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.