John J. Steffen
11Patents
7h-index
13Co-inventors
59Inventor score
Filing activity: Dec 28, 1989 → Nov 24, 2004
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5312007A | Slackless railway coupler with draft/buff gear | Performing Operations; Transporting | 44 | Expired |
| US6446820B1 | Railcar draft gear assembly and system | Performing Operations; Transporting | 34 | Expired |
| US6681943B2 | Railcar draft gear assembly and system | Performing Operations; Transporting | 26 | Expired |
| US6360906B1 | Slackless railway coupler with buff/draft gear | Performing Operations; Transporting | 21 | Expired |
| US5809899A | Draft sill and wheel truck connection | Performing Operations; Transporting | 9 | Expired |
| US5809898A | Ring seat removal system for a railcar articulate connector | Emerging Cross-Sectional Technologies | 8 | Expired |
| US6167813A | Tapered wear liner and articulated connector with tapered wear liner | Performing Operations; Transporting | 7 | Expired |
| US5080242A | Slackless railcar connections with upward wear indicator | Performing Operations; Transporting | 7 | Expired |
| US5193699A | Center sill with short yoke member for converting from coupler to drawbar arrangement without modifying center sill | Performing Operations; Transporting | 4 | Expired |
| US7430794B2 | Method for replacing a damaged railroad freight car brake beam | Emerging Cross-Sectional Technologies | 4 | Active |
| US5850929A | Ring seat removal system for a railcar articulated connector | Emerging Cross-Sectional Technologies | 1 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.