Inventor · disambiguated record
John J. Steffen
Also filed as: STEFFEN JOHN J · STEFFEN LEGAL REPRESENTATIVE LEE ANN
11 granted patents·304 citations·filing 1989–2004
92Inventor score
Top patents by PatentIndex Score
11 records- 0193US6446820B1Railcar draft gear assembly and systemAMSTED IND INC·Filed 2000·Granted Sep 10, 2002·76 cites·27 claims
- 0291US6681943B2Railcar draft gear assembly and systemAMSTED IND INC·Filed 2002·Granted Jan 27, 2004·52 cites·18 claims
- 0390US5312007ASlackless railway coupler with draft/buff gearAMSTED IND INC·Filed 1992·Granted May 17, 1994·72 cites·5 claims
- 0484US6360906B1Slackless railway coupler with buff/draft gearAMSTED IND INC·Filed 2000·Granted Mar 26, 2002·32 cites·9 claims
- 0557US7430794B2Method for replacing a damaged railroad freight car brake beamPOWERBRACE CORP·Filed 2004·Granted Oct 7, 2008·6 cites·43 claims
- 0655US5809898ARing seat removal system for a railcar articulate connectorAMSTED IND INC·Filed 1997·Granted Sep 22, 1998·15 cites·4 claims
- 0755US5809899ADraft sill and wheel truck connectionAMSTED IND INC·Filed 1996·Granted Sep 22, 1998·18 cites·70 claims
- 0849US6167813B1Tapered wear liner and articulated connector with tapered wear linerAMSTED IND INC·Filed 1998·Granted Jan 2, 2001·13 cites·21 claims
- 0944US5193699ACenter sill with short yoke member for converting from coupler to drawbar arrangement without modifying center sillAMSTED IND INC·Filed 1991·Granted Mar 16, 1993·10 cites·13 claims
- 1043US5080242ASlackless railcar connections with upward wear indicatorAMSTED IND INC·Filed 1989·Granted Jan 14, 1992·8 cites·19 claims
- 1132US5850929ARing seat removal system for a railcar articulated connectorAMSTED IND INC·Filed 1998·Granted Dec 22, 1998·2 cites·3 claims
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